I won't bother telling the story of all that happened next: the calculations and experiments confirming that uranium really was splitting into lighter nuclei, the development of the atomic bomb, which Meitner refused to participate in, how she was nonetheless hailed as the \"Jewish mother of the bomb\" when she came to America in 1946 - and how Hahn alone got the Nobel prize for fission, also in 1946.<\/p>
It's particularly irksome how Hahn seemed to claim all the credit for himself in his later years. But history has dealt him a bit of poetic justice. Element 105 was tentatively called \"hahnium\" by a team of scientists at Berkeley who produced it, but later, the International Union of Pure and Applied Chemistry decreed that it be dubbed \"dubnium\" - after Dubna, where a Russian team also made this element. <\/p>
To prevent confusion, no other element can now be called \"hahnium\". But element 109 is called \"meitnerium\". <\/p>
For more, I highly recommend this biography:<\/p>
\u2022 Ruth Sime, Lise Meitner: A Life in Physics, University of California Press, 1997. <\/p>
(n\/7, n = 7)<\/p>","url":"https:\/\/mathstodon.xyz\/@johncarlosbaez\/115490812639305991","status_net":{"notice_id":null}},"to":[{"objectType":"http:\/\/activitystrea.ms\/schema\/1.0\/collection","id":"http:\/\/activityschema.org\/collection\/public"}],"status_net":{"conversation":"tag:gnusocial.jp,2025-11-04:objectType=thread:nonce=eb1a2f74ff969cb5","notice_info":{"local_id":"11460450","source":"ActivityPub","repeat_of":"11457101"}},"published":"2025-11-06T01:59:48+00:00","provider":{"objectType":"service","displayName":"GNU social JP","url":"https:\/\/gnusocial.jp\/"},"title":"blaise repeated a notice by johncarlosbaez","verb":"share","url":"https:\/\/hachyderm.io\/users\/blaise\/statuses\/115500271906805910\/activity"},{"actor":{"id":"https:\/\/hachyderm.io\/users\/blaise","displayName":"Blaise Pab\u00f3n - controlpl4n3","status_net":{"avatarLinks":[{"url":"https:\/\/gnusocial.jp\/avatar\/36622-original-tmp20230620024809.webp","rel":"avatar","type":"image\/webp","width":400,"height":400},{"url":"https:\/\/gnusocial.jp\/avatar\/36622-96-20240126201842.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},{"url":"https:\/\/gnusocial.jp\/avatar\/36622-48-20240126201842.webp","rel":"avatar","type":"image\/webp","width":48,"height":48},{"url":"https:\/\/gnusocial.jp\/avatar\/36622-24-20240126201842.webp","rel":"avatar","type":"image\/webp","width":24,"height":24}],"profile_info":{"local_id":"36622"}},"image":{"url":"https:\/\/gnusocial.jp\/avatar\/36622-96-20240126201842.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},"objectType":"person","summary":"Open Source Apothecary, Internet Elder\ud83c\uddfa\ud83c\uddf8 \ud83c\uddea\ud83c\uddf8 \ud83c\uddf5\ud83c\uddf7 \ud83c\uddf2\ud83c\uddfd \ud83c\uddef\ud83c\uddf5 and back again.#ADHD #autism #bass player #boricua #ComplexityWranglers #coop #fountainpens #HamRadio #mycology #Sanskrit #neurodivergence #yogaFollow @blaise for steady boosts of #OpenSource, #python","url":"https:\/\/hachyderm.io\/@blaise","portablecontacts_net":{"preferredUsername":"blaise","displayName":"Blaise Pab\u00f3n - controlpl4n3","note":"Open Source Apothecary, Internet Elder\ud83c\uddfa\ud83c\uddf8 \ud83c\uddea\ud83c\uddf8 \ud83c\uddf5\ud83c\uddf7 \ud83c\uddf2\ud83c\uddfd \ud83c\uddef\ud83c\uddf5 and back again.#ADHD #autism #bass player #boricua #ComplexityWranglers #coop #fountainpens #HamRadio #mycology #Sanskrit #neurodivergence #yogaFollow @blaise for steady boosts of #OpenSource, #python"}},"content":"RT @blaise @johncarlosbaez @annehargreaves Well, my (female) chemistry teacher at school mentioned the "Chemikerglatze" (chemist's baldness) caused by crouching over the experiment and not pulling back fast enough when it explodes.","generator":{"id":"tag:gnusocial.jp,2026-08-16:notice-source:ActivityPub","objectType":"application","status_net":{"source_code":"ActivityPub"}},"id":"https:\/\/hachyderm.io\/users\/blaise\/statuses\/115500275484466677\/activity","object":{"id":"https:\/\/mathstodon.xyz\/users\/johncarlosbaez\/statuses\/115491836956435865","objectType":"note","content":"
@annehargreaves<\/a> - yes, it was a pretty pathetic excuse.<\/p>","url":"https:\/\/mathstodon.xyz\/@johncarlosbaez\/115491836956435865","status_net":{"notice_id":null}},"to":[{"objectType":"http:\/\/activitystrea.ms\/schema\/1.0\/collection","id":"http:\/\/activityschema.org\/collection\/public"}],"status_net":{"conversation":"tag:gnusocial.jp,2025-11-04:objectType=thread:nonce=eb1a2f74ff969cb5","notice_info":{"local_id":"11460449","source":"ActivityPub","repeat_of":"11460447"}},"published":"2025-11-06T01:59:41+00:00","provider":{"objectType":"service","displayName":"GNU social JP","url":"https:\/\/gnusocial.jp\/"},"title":"blaise repeated a notice by johncarlosbaez","verb":"share","url":"https:\/\/hachyderm.io\/users\/blaise\/statuses\/115500275484466677\/activity"},{"actor":{"id":"https:\/\/mathstodon.xyz\/users\/johncarlosbaez","displayName":"John Carlos Baez","status_net":{"avatarLinks":[{"url":"https:\/\/gnusocial.jp\/avatar\/83718-original-tmp20250418072433.webp","rel":"avatar","type":"image\/webp","width":400,"height":400},{"url":"https:\/\/gnusocial.jp\/avatar\/83718-96-20250418093131.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},{"url":"https:\/\/gnusocial.jp\/avatar\/83718-48-20250418093131.webp","rel":"avatar","type":"image\/webp","width":48,"height":48},{"url":"https:\/\/gnusocial.jp\/avatar\/83718-24-20250418120427.webp","rel":"avatar","type":"image\/webp","width":24,"height":24}],"profile_info":{"local_id":"83718"}},"image":{"url":"https:\/\/gnusocial.jp\/avatar\/83718-96-20250418093131.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},"objectType":"person","summary":"I'm a mathematical physicist who likes explaining stuff. I'm the Maxwell Fellow of Public Engagement at the School of Mathematics and the School of Physics and Astronomy at the University of Edinburgh. Check out my blog Azimuth! I'm also a member of the n-Category Caf\u00e9, a group blog on math with an emphasis on category theory. I also have a YouTube channel, full of talks about math, physics and the future.","url":"https:\/\/mathstodon.xyz\/@johncarlosbaez","portablecontacts_net":{"preferredUsername":"johncarlosbaez","displayName":"John Carlos Baez","note":"I'm a mathematical physicist who likes explaining stuff. I'm the Maxwell Fellow of Public Engagement at the School of Mathematics and the School of Physics and Astronomy at the University of Edinburgh. Check out my blog Azimuth! I'm also a member of the n-Category Caf\u00e9, a group blog on math with an emphasis on category theory. I also have a YouTube channel, full of talks about math, physics and the future."}},"content":" @annehargreaves<\/a> - yes, it was a pretty pathetic excuse.<\/p>","generator":{"id":"tag:gnusocial.jp,2026-08-16:notice-source:ActivityPub","objectType":"application","status_net":{"source_code":"ActivityPub"}},"id":"https:\/\/mathstodon.xyz\/users\/johncarlosbaez\/statuses\/115491836956435865","object":{"id":"https:\/\/mathstodon.xyz\/users\/johncarlosbaez\/statuses\/115491836956435865","objectType":"note","content":" @annehargreaves<\/a> - yes, it was a pretty pathetic excuse.<\/p>","url":"https:\/\/mathstodon.xyz\/@johncarlosbaez\/115491836956435865","status_net":{"notice_id":null},"inReplyTo":{"objectType":"note","id":"https:\/\/ioc.exchange\/users\/annehargreaves\/statuses\/115491608949397873","url":"https:\/\/ioc.exchange\/@annehargreaves\/115491608949397873"}},"to":[{"objectType":"http:\/\/activitystrea.ms\/schema\/1.0\/person","id":"https:\/\/ioc.exchange\/users\/annehargreaves"},{"objectType":"http:\/\/activitystrea.ms\/schema\/1.0\/collection","id":"http:\/\/activityschema.org\/collection\/public"}],"status_net":{"conversation":"tag:gnusocial.jp,2025-11-04:objectType=thread:nonce=eb1a2f74ff969cb5","notice_info":{"local_id":"11460447","source":"ActivityPub"}},"published":"2025-11-06T01:59:31+00:00","provider":{"objectType":"service","displayName":"GNU social JP","url":"https:\/\/gnusocial.jp\/"},"verb":"post","url":"https:\/\/mathstodon.xyz\/@johncarlosbaez\/115491836956435865"},{"actor":{"id":"https:\/\/ioc.exchange\/users\/annehargreaves","displayName":"AnneH","status_net":{"avatarLinks":[{"url":"https:\/\/gnusocial.jp\/avatar\/263517-original-tmp20260304092713.webp","rel":"avatar","type":"image\/webp","width":400,"height":400},{"url":"https:\/\/gnusocial.jp\/avatar\/263517-96-20260308135337.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},{"url":"https:\/\/gnusocial.jp\/avatar\/263517-48-20260304200707.webp","rel":"avatar","type":"image\/webp","width":48,"height":48},{"url":"https:\/\/gnusocial.jp\/avatar\/263517-24-20260308135337.webp","rel":"avatar","type":"image\/webp","width":24,"height":24}],"profile_info":{"local_id":"263517"}},"image":{"url":"https:\/\/gnusocial.jp\/avatar\/263517-96-20260308135337.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},"objectType":"person","summary":"Translator, tech lurker","url":"https:\/\/ioc.exchange\/@annehargreaves","portablecontacts_net":{"preferredUsername":"annehargreaves","displayName":"AnneH","note":"Translator, tech lurker"}},"content":" @johncarlosbaez<\/a> Thanks for sharing! What a life. Women chemists' hair might catch fire\ud83e\udd23 I've heard some feeble excuses but that's a corker!<\/p>","generator":{"id":"tag:gnusocial.jp,2026-08-16:notice-source:ActivityPub","objectType":"application","status_net":{"source_code":"ActivityPub"}},"id":"https:\/\/ioc.exchange\/users\/annehargreaves\/statuses\/115491608949397873","object":{"id":"https:\/\/ioc.exchange\/users\/annehargreaves\/statuses\/115491608949397873","objectType":"note","content":" @johncarlosbaez<\/a> Thanks for sharing! What a life. Women chemists' hair might catch fire\ud83e\udd23 I've heard some feeble excuses but that's a corker!<\/p>","url":"https:\/\/ioc.exchange\/@annehargreaves\/115491608949397873","status_net":{"notice_id":null},"inReplyTo":{"objectType":"note","id":"https:\/\/mathstodon.xyz\/users\/johncarlosbaez\/statuses\/115490812639305991","url":"https:\/\/mathstodon.xyz\/@johncarlosbaez\/115490812639305991"}},"to":[{"objectType":"http:\/\/activitystrea.ms\/schema\/1.0\/person","id":"https:\/\/mathstodon.xyz\/users\/johncarlosbaez"},{"objectType":"http:\/\/activitystrea.ms\/schema\/1.0\/collection","id":"http:\/\/activityschema.org\/collection\/public"}],"status_net":{"conversation":"tag:gnusocial.jp,2025-11-04:objectType=thread:nonce=eb1a2f74ff969cb5","notice_info":{"local_id":"11460446","source":"ActivityPub"}},"published":"2025-11-06T01:59:31+00:00","provider":{"objectType":"service","displayName":"GNU social JP","url":"https:\/\/gnusocial.jp\/"},"verb":"post","url":"https:\/\/ioc.exchange\/@annehargreaves\/115491608949397873"},{"actor":{"id":"https:\/\/berlin.social\/users\/slowtiger","displayName":"slowtiger","status_net":{"avatarLinks":[{"url":"https:\/\/gnusocial.jp\/avatar\/155455-original-tmp20250226092515.webp","rel":"avatar","type":"image\/webp","width":400,"height":400},{"url":"https:\/\/gnusocial.jp\/avatar\/155455-96-20250302120155.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},{"url":"https:\/\/gnusocial.jp\/avatar\/155455-48-20250302105034.webp","rel":"avatar","type":"image\/webp","width":48,"height":48},{"url":"https:\/\/gnusocial.jp\/avatar\/155455-24-20250302120155.webp","rel":"avatar","type":"image\/webp","width":24,"height":24}],"profile_info":{"local_id":"155455"}},"image":{"url":"https:\/\/gnusocial.jp\/avatar\/155455-96-20250302120155.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},"objectType":"person","summary":"trickfilme aus eigener herstellung. searching for a loophole since 1962. You can hire me: https:\/\/vimeo.com\/enigmation\/hire-meslowtiger@snafu.delast film: "Spoon" http:\/\/vimeo.com\/333837958music: http:\/\/slowtiger.bandcamp.com","url":"https:\/\/berlin.social\/@slowtiger","portablecontacts_net":{"preferredUsername":"slowtiger","displayName":"slowtiger","note":"trickfilme aus eigener herstellung. searching for a loophole since 1962. You can hire me: https:\/\/vimeo.com\/enigmation\/hire-meslowtiger@snafu.delast film: "Spoon" http:\/\/vimeo.com\/333837958music: http:\/\/slowtiger.bandcamp.com"}},"content":" @johncarlosbaez<\/a> @annehargreaves<\/a> Well, my (female) chemistry teacher at school mentioned the \"Chemikerglatze\" (chemist's baldness) caused by crouching over the experiment and not pulling back fast enough when it explodes.<\/p>","generator":{"id":"tag:gnusocial.jp,2026-08-16:notice-source:ActivityPub","objectType":"application","status_net":{"source_code":"ActivityPub"}},"id":"https:\/\/berlin.social\/users\/slowtiger\/statuses\/115492120314392316","object":{"id":"https:\/\/berlin.social\/users\/slowtiger\/statuses\/115492120314392316","objectType":"note","content":" @johncarlosbaez<\/a> @annehargreaves<\/a> Well, my (female) chemistry teacher at school mentioned the \"Chemikerglatze\" (chemist's baldness) caused by crouching over the experiment and not pulling back fast enough when it explodes.<\/p>","url":"https:\/\/berlin.social\/@slowtiger\/115492120314392316","status_net":{"notice_id":null},"inReplyTo":{"objectType":"note","id":"https:\/\/mathstodon.xyz\/users\/johncarlosbaez\/statuses\/115491836956435865","url":"https:\/\/mathstodon.xyz\/@johncarlosbaez\/115491836956435865"}},"to":[{"objectType":"http:\/\/activitystrea.ms\/schema\/1.0\/person","id":"https:\/\/mathstodon.xyz\/users\/johncarlosbaez"},{"objectType":"http:\/\/activitystrea.ms\/schema\/1.0\/person","id":"https:\/\/ioc.exchange\/users\/annehargreaves"},{"objectType":"http:\/\/activitystrea.ms\/schema\/1.0\/collection","id":"http:\/\/activityschema.org\/collection\/public"}],"status_net":{"conversation":"tag:gnusocial.jp,2025-11-04:objectType=thread:nonce=eb1a2f74ff969cb5","notice_info":{"local_id":"11460448","source":"ActivityPub"}},"published":"2025-11-06T01:59:29+00:00","provider":{"objectType":"service","displayName":"GNU social JP","url":"https:\/\/gnusocial.jp\/"},"verb":"post","url":"https:\/\/berlin.social\/@slowtiger\/115492120314392316"},{"actor":{"id":"https:\/\/hachyderm.io\/users\/blaise","displayName":"Blaise Pab\u00f3n - controlpl4n3","status_net":{"avatarLinks":[{"url":"https:\/\/gnusocial.jp\/avatar\/36622-original-tmp20230620024809.webp","rel":"avatar","type":"image\/webp","width":400,"height":400},{"url":"https:\/\/gnusocial.jp\/avatar\/36622-96-20240126201842.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},{"url":"https:\/\/gnusocial.jp\/avatar\/36622-48-20240126201842.webp","rel":"avatar","type":"image\/webp","width":48,"height":48},{"url":"https:\/\/gnusocial.jp\/avatar\/36622-24-20240126201842.webp","rel":"avatar","type":"image\/webp","width":24,"height":24}],"profile_info":{"local_id":"36622"}},"image":{"url":"https:\/\/gnusocial.jp\/avatar\/36622-96-20240126201842.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},"objectType":"person","summary":"Open Source Apothecary, Internet Elder\ud83c\uddfa\ud83c\uddf8 \ud83c\uddea\ud83c\uddf8 \ud83c\uddf5\ud83c\uddf7 \ud83c\uddf2\ud83c\uddfd \ud83c\uddef\ud83c\uddf5 and back again.#ADHD #autism #bass player #boricua #ComplexityWranglers #coop #fountainpens #HamRadio #mycology #Sanskrit #neurodivergence #yogaFollow @blaise for steady boosts of #OpenSource, #python","url":"https:\/\/hachyderm.io\/@blaise","portablecontacts_net":{"preferredUsername":"blaise","displayName":"Blaise Pab\u00f3n - controlpl4n3","note":"Open Source Apothecary, Internet Elder\ud83c\uddfa\ud83c\uddf8 \ud83c\uddea\ud83c\uddf8 \ud83c\uddf5\ud83c\uddf7 \ud83c\uddf2\ud83c\uddfd \ud83c\uddef\ud83c\uddf5 and back again.#ADHD #autism #bass player #boricua #ComplexityWranglers #coop #fountainpens #HamRadio #mycology #Sanskrit #neurodivergence #yogaFollow @blaise for steady boosts of #OpenSource, #python"}},"content":"RT @blaise @metaweta @j_bertolotti - luckily I know of nobody arguing about who was better, Noether or Meitner!","generator":{"id":"tag:gnusocial.jp,2026-08-16:notice-source:ActivityPub","objectType":"application","status_net":{"source_code":"ActivityPub"}},"id":"https:\/\/hachyderm.io\/users\/blaise\/statuses\/115500273836130191\/activity","object":{"id":"https:\/\/mathstodon.xyz\/users\/metaweta\/statuses\/115498882326371016","objectType":"note","content":" @johncarlosbaez<\/a> @j_bertolotti<\/a> Reminds me of Handel and Bach: @johncarlosbaez<\/a> @j_bertolotti<\/a> Reminds me of Handel and Bach: @johncarlosbaez<\/a> @j_bertolotti<\/a> Reminds me of Handel and Bach: @metaweta<\/a> @j_bertolotti<\/a> - luckily I know of nobody arguing about who was better, Noether or Meitner!<\/p>","generator":{"id":"tag:gnusocial.jp,2026-08-16:notice-source:ActivityPub","objectType":"application","status_net":{"source_code":"ActivityPub"}},"id":"https:\/\/mathstodon.xyz\/users\/johncarlosbaez\/statuses\/115499274565732305","object":{"id":"https:\/\/mathstodon.xyz\/users\/johncarlosbaez\/statuses\/115499274565732305","objectType":"note","content":" @metaweta<\/a> @j_bertolotti<\/a> - luckily I know of nobody arguing about who was better, Noether or Meitner!<\/p>","url":"https:\/\/mathstodon.xyz\/@johncarlosbaez\/115499274565732305","status_net":{"notice_id":null},"inReplyTo":{"objectType":"note","id":"https:\/\/mathstodon.xyz\/users\/metaweta\/statuses\/115498882326371016","url":"https:\/\/mathstodon.xyz\/@metaweta\/115498882326371016"}},"to":[{"objectType":"http:\/\/activitystrea.ms\/schema\/1.0\/person","id":"https:\/\/mathstodon.xyz\/users\/j_bertolotti"},{"objectType":"http:\/\/activitystrea.ms\/schema\/1.0\/person","id":"https:\/\/mathstodon.xyz\/users\/metaweta"},{"objectType":"http:\/\/activitystrea.ms\/schema\/1.0\/collection","id":"http:\/\/activityschema.org\/collection\/public"}],"status_net":{"conversation":"tag:gnusocial.jp,2025-11-04:objectType=thread:nonce=eb1a2f74ff969cb5","notice_info":{"local_id":"11460442","source":"ActivityPub"}},"published":"2025-11-06T01:59:04+00:00","provider":{"objectType":"service","displayName":"GNU social JP","url":"https:\/\/gnusocial.jp\/"},"verb":"post","url":"https:\/\/mathstodon.xyz\/@johncarlosbaez\/115499274565732305"},{"actor":{"id":"https:\/\/hachyderm.io\/users\/blaise","displayName":"Blaise Pab\u00f3n - controlpl4n3","status_net":{"avatarLinks":[{"url":"https:\/\/gnusocial.jp\/avatar\/36622-original-tmp20230620024809.webp","rel":"avatar","type":"image\/webp","width":400,"height":400},{"url":"https:\/\/gnusocial.jp\/avatar\/36622-96-20240126201842.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},{"url":"https:\/\/gnusocial.jp\/avatar\/36622-48-20240126201842.webp","rel":"avatar","type":"image\/webp","width":48,"height":48},{"url":"https:\/\/gnusocial.jp\/avatar\/36622-24-20240126201842.webp","rel":"avatar","type":"image\/webp","width":24,"height":24}],"profile_info":{"local_id":"36622"}},"image":{"url":"https:\/\/gnusocial.jp\/avatar\/36622-96-20240126201842.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},"objectType":"person","summary":"Open Source Apothecary, Internet Elder\ud83c\uddfa\ud83c\uddf8 \ud83c\uddea\ud83c\uddf8 \ud83c\uddf5\ud83c\uddf7 \ud83c\uddf2\ud83c\uddfd \ud83c\uddef\ud83c\uddf5 and back again.#ADHD #autism #bass player #boricua #ComplexityWranglers #coop #fountainpens #HamRadio #mycology #Sanskrit #neurodivergence #yogaFollow @blaise for steady boosts of #OpenSource, #python","url":"https:\/\/hachyderm.io\/@blaise","portablecontacts_net":{"preferredUsername":"blaise","displayName":"Blaise Pab\u00f3n - controlpl4n3","note":"Open Source Apothecary, Internet Elder\ud83c\uddfa\ud83c\uddf8 \ud83c\uddea\ud83c\uddf8 \ud83c\uddf5\ud83c\uddf7 \ud83c\uddf2\ud83c\uddfd \ud83c\uddef\ud83c\uddf5 and back again.#ADHD #autism #bass player #boricua #ComplexityWranglers #coop #fountainpens #HamRadio #mycology #Sanskrit #neurodivergence #yogaFollow @blaise for steady boosts of #OpenSource, #python"}},"content":"RT @blaise @j_bertolotti - that's a very interesting question! Noether lost her position in Germany in 1933 when Hitler came to power, and left for the US that year, and teaching at Bryn Mawr (a women's college). Meitner also lost her job in 1933, but hung on in Germany until 1938 thanks to her Austrian citizenship. When Austria was taken over, she fled.But earlier, I believe Noether was mainly in Goettingen, mainly doing pure mathematics, while Meitner was in Berlin doing experiments in nuclear physics. So they might have never met each other!","generator":{"id":"tag:gnusocial.jp,2026-08-16:notice-source:ActivityPub","objectType":"application","status_net":{"source_code":"ActivityPub"}},"id":"https:\/\/hachyderm.io\/users\/blaise\/statuses\/115500273125533336\/activity","object":{"id":"https:\/\/mathstodon.xyz\/users\/j_bertolotti\/statuses\/115490980910069617","objectType":"note","content":" @johncarlosbaez<\/a> I wonder if Meitner ever crossed paths with Noether. Both Jews women in Germany struggling to have their genius recognized by a close-minded University system. Both having to flee Germany. Roughly the same age.<\/p> They were interested in very different problems, but I can only imagine what they could have achieved if they ever worked together!<\/p>","url":"https:\/\/mathstodon.xyz\/@j_bertolotti\/115490980910069617","status_net":{"notice_id":null}},"to":[{"objectType":"http:\/\/activitystrea.ms\/schema\/1.0\/collection","id":"http:\/\/activityschema.org\/collection\/public"}],"status_net":{"conversation":"tag:gnusocial.jp,2025-11-04:objectType=thread:nonce=eb1a2f74ff969cb5","notice_info":{"local_id":"11460440","source":"ActivityPub","repeat_of":"11460438"}},"published":"2025-11-06T01:59:02+00:00","provider":{"objectType":"service","displayName":"GNU social JP","url":"https:\/\/gnusocial.jp\/"},"title":"blaise repeated a notice by j_bertolotti","verb":"share","url":"https:\/\/hachyderm.io\/users\/blaise\/statuses\/115500273125533336\/activity"},{"actor":{"id":"https:\/\/mathstodon.xyz\/users\/j_bertolotti","displayName":"j_bertolotti","status_net":{"avatarLinks":[{"url":"https:\/\/gnusocial.jp\/avatar\/113479-original-tmp20240311174920.webp","rel":"avatar","type":"image\/webp","width":400,"height":400},{"url":"https:\/\/gnusocial.jp\/avatar\/113479-96-20240402211733.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},{"url":"https:\/\/gnusocial.jp\/avatar\/113479-48-20240313005953.webp","rel":"avatar","type":"image\/webp","width":48,"height":48},{"url":"https:\/\/gnusocial.jp\/avatar\/113479-24-20240402211733.webp","rel":"avatar","type":"image\/webp","width":24,"height":24}],"profile_info":{"local_id":"113479"}},"image":{"url":"https:\/\/gnusocial.jp\/avatar\/113479-96-20240402211733.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},"objectType":"person","summary":"Associated Professor of Physics at the University of Exeter.Maker of typos.Scientific visualizations (grouped under the hastag #PhysicsFactlet).He\/lui\/on. All opinions are my own fault.","url":"https:\/\/mathstodon.xyz\/@j_bertolotti","portablecontacts_net":{"preferredUsername":"j_bertolotti","displayName":"j_bertolotti","note":"Associated Professor of Physics at the University of Exeter.Maker of typos.Scientific visualizations (grouped under the hastag #PhysicsFactlet).He\/lui\/on. All opinions are my own fault."}},"content":" @johncarlosbaez<\/a> I wonder if Meitner ever crossed paths with Noether. Both Jews women in Germany struggling to have their genius recognized by a close-minded University system. Both having to flee Germany. Roughly the same age.<\/p> They were interested in very different problems, but I can only imagine what they could have achieved if they ever worked together!<\/p>","generator":{"id":"tag:gnusocial.jp,2026-08-16:notice-source:ActivityPub","objectType":"application","status_net":{"source_code":"ActivityPub"}},"id":"https:\/\/mathstodon.xyz\/users\/j_bertolotti\/statuses\/115490980910069617","object":{"id":"https:\/\/mathstodon.xyz\/users\/j_bertolotti\/statuses\/115490980910069617","objectType":"note","content":" @johncarlosbaez<\/a> I wonder if Meitner ever crossed paths with Noether. Both Jews women in Germany struggling to have their genius recognized by a close-minded University system. Both having to flee Germany. Roughly the same age.<\/p> They were interested in very different problems, but I can only imagine what they could have achieved if they ever worked together!<\/p>","url":"https:\/\/mathstodon.xyz\/@j_bertolotti\/115490980910069617","status_net":{"notice_id":null},"inReplyTo":{"objectType":"note","id":"https:\/\/mathstodon.xyz\/users\/johncarlosbaez\/statuses\/115490812639305991","url":"https:\/\/mathstodon.xyz\/@johncarlosbaez\/115490812639305991"}},"to":[{"objectType":"http:\/\/activitystrea.ms\/schema\/1.0\/person","id":"https:\/\/mathstodon.xyz\/users\/johncarlosbaez"},{"objectType":"http:\/\/activitystrea.ms\/schema\/1.0\/collection","id":"http:\/\/activityschema.org\/collection\/public"}],"status_net":{"conversation":"tag:gnusocial.jp,2025-11-04:objectType=thread:nonce=eb1a2f74ff969cb5","notice_info":{"local_id":"11460438","source":"ActivityPub"}},"published":"2025-11-06T01:58:52+00:00","provider":{"objectType":"service","displayName":"GNU social JP","url":"https:\/\/gnusocial.jp\/"},"verb":"post","url":"https:\/\/mathstodon.xyz\/@j_bertolotti\/115490980910069617"},{"actor":{"id":"https:\/\/mathstodon.xyz\/users\/johncarlosbaez","displayName":"John Carlos Baez","status_net":{"avatarLinks":[{"url":"https:\/\/gnusocial.jp\/avatar\/83718-original-tmp20250418072433.webp","rel":"avatar","type":"image\/webp","width":400,"height":400},{"url":"https:\/\/gnusocial.jp\/avatar\/83718-96-20250418093131.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},{"url":"https:\/\/gnusocial.jp\/avatar\/83718-48-20250418093131.webp","rel":"avatar","type":"image\/webp","width":48,"height":48},{"url":"https:\/\/gnusocial.jp\/avatar\/83718-24-20250418120427.webp","rel":"avatar","type":"image\/webp","width":24,"height":24}],"profile_info":{"local_id":"83718"}},"image":{"url":"https:\/\/gnusocial.jp\/avatar\/83718-96-20250418093131.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},"objectType":"person","summary":"I'm a mathematical physicist who likes explaining stuff. I'm the Maxwell Fellow of Public Engagement at the School of Mathematics and the School of Physics and Astronomy at the University of Edinburgh. Check out my blog Azimuth! I'm also a member of the n-Category Caf\u00e9, a group blog on math with an emphasis on category theory. I also have a YouTube channel, full of talks about math, physics and the future.","url":"https:\/\/mathstodon.xyz\/@johncarlosbaez","portablecontacts_net":{"preferredUsername":"johncarlosbaez","displayName":"John Carlos Baez","note":"I'm a mathematical physicist who likes explaining stuff. I'm the Maxwell Fellow of Public Engagement at the School of Mathematics and the School of Physics and Astronomy at the University of Edinburgh. Check out my blog Azimuth! I'm also a member of the n-Category Caf\u00e9, a group blog on math with an emphasis on category theory. I also have a YouTube channel, full of talks about math, physics and the future."}},"content":" @j_bertolotti<\/a> - that's a very interesting question! Noether lost her position in Germany in 1933 when Hitler came to power, and left for the US that year, and teaching at Bryn Mawr (a women's college). Meitner also lost her job in 1933, but hung on in Germany until 1938 thanks to her Austrian citizenship. When Austria was taken over, she fled.<\/p> But earlier, I believe Noether was mainly in Goettingen, mainly doing pure mathematics, while Meitner was in Berlin doing experiments in nuclear physics. So they might have never met each other!<\/p>","generator":{"id":"tag:gnusocial.jp,2026-08-16:notice-source:ActivityPub","objectType":"application","status_net":{"source_code":"ActivityPub"}},"id":"https:\/\/mathstodon.xyz\/users\/johncarlosbaez\/statuses\/115491275936428364","object":{"id":"https:\/\/mathstodon.xyz\/users\/johncarlosbaez\/statuses\/115491275936428364","objectType":"note","content":" @j_bertolotti<\/a> - that's a very interesting question! Noether lost her position in Germany in 1933 when Hitler came to power, and left for the US that year, and teaching at Bryn Mawr (a women's college). Meitner also lost her job in 1933, but hung on in Germany until 1938 thanks to her Austrian citizenship. When Austria was taken over, she fled.<\/p> But earlier, I believe Noether was mainly in Goettingen, mainly doing pure mathematics, while Meitner was in Berlin doing experiments in nuclear physics. So they might have never met each other!<\/p>","url":"https:\/\/mathstodon.xyz\/@johncarlosbaez\/115491275936428364","status_net":{"notice_id":null},"inReplyTo":{"objectType":"note","id":"https:\/\/mathstodon.xyz\/users\/j_bertolotti\/statuses\/115490980910069617","url":"https:\/\/mathstodon.xyz\/@j_bertolotti\/115490980910069617"}},"to":[{"objectType":"http:\/\/activitystrea.ms\/schema\/1.0\/person","id":"https:\/\/mathstodon.xyz\/users\/j_bertolotti"},{"objectType":"http:\/\/activitystrea.ms\/schema\/1.0\/collection","id":"http:\/\/activityschema.org\/collection\/public"}],"status_net":{"conversation":"tag:gnusocial.jp,2025-11-04:objectType=thread:nonce=eb1a2f74ff969cb5","notice_info":{"local_id":"11460439","source":"ActivityPub"}},"published":"2025-11-06T01:58:51+00:00","provider":{"objectType":"service","displayName":"GNU social JP","url":"https:\/\/gnusocial.jp\/"},"verb":"post","url":"https:\/\/mathstodon.xyz\/@johncarlosbaez\/115491275936428364"},{"actor":{"id":"https:\/\/hachyderm.io\/users\/blaise","displayName":"Blaise Pab\u00f3n - controlpl4n3","status_net":{"avatarLinks":[{"url":"https:\/\/gnusocial.jp\/avatar\/36622-original-tmp20230620024809.webp","rel":"avatar","type":"image\/webp","width":400,"height":400},{"url":"https:\/\/gnusocial.jp\/avatar\/36622-96-20240126201842.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},{"url":"https:\/\/gnusocial.jp\/avatar\/36622-48-20240126201842.webp","rel":"avatar","type":"image\/webp","width":48,"height":48},{"url":"https:\/\/gnusocial.jp\/avatar\/36622-24-20240126201842.webp","rel":"avatar","type":"image\/webp","width":24,"height":24}],"profile_info":{"local_id":"36622"}},"image":{"url":"https:\/\/gnusocial.jp\/avatar\/36622-96-20240126201842.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},"objectType":"person","summary":"Open Source Apothecary, Internet Elder\ud83c\uddfa\ud83c\uddf8 \ud83c\uddea\ud83c\uddf8 \ud83c\uddf5\ud83c\uddf7 \ud83c\uddf2\ud83c\uddfd \ud83c\uddef\ud83c\uddf5 and back again.#ADHD #autism #bass player #boricua #ComplexityWranglers #coop #fountainpens #HamRadio #mycology #Sanskrit #neurodivergence #yogaFollow @blaise for steady boosts of #OpenSource, #python","url":"https:\/\/hachyderm.io\/@blaise","portablecontacts_net":{"preferredUsername":"blaise","displayName":"Blaise Pab\u00f3n - controlpl4n3","note":"Open Source Apothecary, Internet Elder\ud83c\uddfa\ud83c\uddf8 \ud83c\uddea\ud83c\uddf8 \ud83c\uddf5\ud83c\uddf7 \ud83c\uddf2\ud83c\uddfd \ud83c\uddef\ud83c\uddf5 and back again.#ADHD #autism #bass player #boricua #ComplexityWranglers #coop #fountainpens #HamRadio #mycology #Sanskrit #neurodivergence #yogaFollow @blaise for steady boosts of #OpenSource, #python"}},"content":"RT @blaise I won't bother telling the story of all that happened next: the calculations and experiments confirming that uranium really was splitting into lighter nuclei, the development of the atomic bomb, which Meitner refused to participate in, how she was nonetheless hailed as the "Jewish mother of the bomb" when she came to America in 1946 - and how Hahn alone got the Nobel prize for fission, also in 1946.It<\/a>'s particularly irksome how Hahn seemed to claim all the credit for himself in his later years. But history has dealt him a bit of poetic justice. Element 105 was tentatively called "hahnium" by a team of scientists at Berkeley who produced it, but later, the International Union of Pure and Applied Chemistry decreed that it be dubbed "dubnium" - after Dubna, where a Russian team also made this element. To prevent confusion, no other element can now be called "hahnium". But element 109 is called "meitnerium". For more, I highly recommend this biography:\u2022 Ruth Sime, Lise Meitner: A Life in Physics, University of California Press, 1997. (n\/7, n = 7)","generator":{"id":"tag:gnusocial.jp,2026-08-16:notice-source:ActivityPub","objectType":"application","status_net":{"source_code":"ActivityPub"}},"id":"https:\/\/hachyderm.io\/users\/blaise\/statuses\/115500271257613291\/activity","object":{"id":"https:\/\/mathstodon.xyz\/users\/johncarlosbaez\/statuses\/115490788701067261","objectType":"note","content":" Given Lise Meitner's very tough situation, and Hahn's complaints to her, it's no surprise that she wrote to him:<\/p> \"Perhaps you cannot fully appreciate how unhappy it makes me to realize that you always think I am unfair and embittered, and that you also say so to other people. If you think it over, it cannot be difficult to understand what it means to me that I have none of my scientific equipment. For me that is much harder than everything else. But I am really not embittered - it is just that I see no real purpose in my life at the moment and I am very lonely....\" <\/p> What *is* a surprise is that this is when she made her greatest discovery. <\/p> She couldn't bear spending the Christmas of 1938 alone, so she visited a friend in a small seaside village, and so did her nephew Otto Frisch, who was also an excellent physicist. They began talking about physics. According to letters from Hahn and Strassman, one of the \"transuranics\" was acting a lot like barium. <\/p> Talking over the problem, Meitner and Frisch realized what was going on: the neutrons were making uranium nuclei split into a variety of much lighter elements!<\/p> In short: fission. <\/p> (6\/n)<\/p>","url":"https:\/\/mathstodon.xyz\/@johncarlosbaez\/115490788701067261","status_net":{"notice_id":null}},"to":[{"objectType":"http:\/\/activitystrea.ms\/schema\/1.0\/collection","id":"http:\/\/activityschema.org\/collection\/public"}],"status_net":{"conversation":"tag:gnusocial.jp,2025-11-04:objectType=thread:nonce=eb1a2f74ff969cb5","notice_info":{"local_id":"11460437","source":"ActivityPub","repeat_of":"11447892"}},"published":"2025-11-06T01:58:21+00:00","provider":{"objectType":"service","displayName":"GNU social JP","url":"https:\/\/gnusocial.jp\/"},"title":"blaise repeated a notice by johncarlosbaez","verb":"share","url":"https:\/\/hachyderm.io\/users\/blaise\/statuses\/115500271257613291\/activity"},{"actor":{"id":"https:\/\/hachyderm.io\/users\/blaise","displayName":"Blaise Pab\u00f3n - controlpl4n3","status_net":{"avatarLinks":[{"url":"https:\/\/gnusocial.jp\/avatar\/36622-original-tmp20230620024809.webp","rel":"avatar","type":"image\/webp","width":400,"height":400},{"url":"https:\/\/gnusocial.jp\/avatar\/36622-96-20240126201842.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},{"url":"https:\/\/gnusocial.jp\/avatar\/36622-48-20240126201842.webp","rel":"avatar","type":"image\/webp","width":48,"height":48},{"url":"https:\/\/gnusocial.jp\/avatar\/36622-24-20240126201842.webp","rel":"avatar","type":"image\/webp","width":24,"height":24}],"profile_info":{"local_id":"36622"}},"image":{"url":"https:\/\/gnusocial.jp\/avatar\/36622-96-20240126201842.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},"objectType":"person","summary":"Open Source Apothecary, Internet Elder\ud83c\uddfa\ud83c\uddf8 \ud83c\uddea\ud83c\uddf8 \ud83c\uddf5\ud83c\uddf7 \ud83c\uddf2\ud83c\uddfd \ud83c\uddef\ud83c\uddf5 and back again.#ADHD #autism #bass player #boricua #ComplexityWranglers #coop #fountainpens #HamRadio #mycology #Sanskrit #neurodivergence #yogaFollow @blaise for steady boosts of #OpenSource, #python","url":"https:\/\/hachyderm.io\/@blaise","portablecontacts_net":{"preferredUsername":"blaise","displayName":"Blaise Pab\u00f3n - controlpl4n3","note":"Open Source Apothecary, Internet Elder\ud83c\uddfa\ud83c\uddf8 \ud83c\uddea\ud83c\uddf8 \ud83c\uddf5\ud83c\uddf7 \ud83c\uddf2\ud83c\uddfd \ud83c\uddef\ud83c\uddf5 and back again.#ADHD #autism #bass player #boricua #ComplexityWranglers #coop #fountainpens #HamRadio #mycology #Sanskrit #neurodivergence #yogaFollow @blaise for steady boosts of #OpenSource, #python"}},"content":"RT @blaise Given Lise Meitner's very tough situation, and Hahn's complaints to her, it's no surprise that she wrote to him: "Perhaps you cannot fully appreciate how unhappy it makes me to realize that you always think I am unfair and embittered, and that you also say so to other people. If you think it over, it cannot be difficult to understand what it means to me that I have none of my scientific equipment. For me that is much harder than everything else. But I am really not embittered - it is just that I see no real purpose in my life at the moment and I am very lonely...." What *is* a surprise is that this is when she made her greatest discovery. She couldn't bear spending the Christmas of 1938 alone, so she visited a friend in a small seaside village, and so did her nephew Otto Frisch, who was also an excellent physicist. They began talking about physics. According to letters from Hahn and Strassman, one of the "transuranics" was acting a lot like barium. Talking over the problem, Meitner and Frisch realized what was going on: the neutrons were making uranium nuclei split into a variety of much lighter elements!In short: fission. (6\/n)","generator":{"id":"tag:gnusocial.jp,2026-08-16:notice-source:ActivityPub","objectType":"application","status_net":{"source_code":"ActivityPub"}},"id":"https:\/\/hachyderm.io\/users\/blaise\/statuses\/115500266347141711\/activity","object":{"id":"https:\/\/mathstodon.xyz\/users\/johncarlosbaez\/statuses\/115490774227404346","objectType":"note","content":" In 1934, Fermi started trying to produce \"transuranics\" - elements above uranium - by firing neutron beams at uranium. Meitner got excited about this and began doing the same with Hahn and another chemist, Fritz Strassman. They seemed to be succeeding, but the results were bizarre: the new elements seemed to decay in many different ways! Their chemical properties were curiously variable as well. And the more experiments the team did, the stranger their results got.<\/p> No doubt this is part of why Meitner took so long to flee Germany. Another reason was her difficulty in finding a job. For a while she was protected somewhat by her Austrian citizenship, but that ended in 1938 when Hitler annexed Austria. After many difficulties, she found an academic position in Stockholm and managed to sneak out of Germany using a no-longer-valid Austria passport.<\/p> She was now 60. She had been the head of a laboratory in Berlin, constantly discussing physics with all the top scientists. Now she was in a country where she couldn't speak the language. She was given a small room to use a lab, but essentially no equipment, and no assistants. She started making her own equipment. <\/p> Hahn continued work with Strassman in Berlin, and Meitner attempted to collaborate from afar, but Hahn stopped citing her contributions, for fear of the Nazis and their hatred of \"decadent Jewish scence\". Meitner complained about this to him. He accused her of being unsympathetic to *his* plight.<\/p> (5\/n)<\/p>","url":"https:\/\/mathstodon.xyz\/@johncarlosbaez\/115490774227404346","status_net":{"notice_id":null}},"to":[{"objectType":"http:\/\/activitystrea.ms\/schema\/1.0\/collection","id":"http:\/\/activityschema.org\/collection\/public"}],"status_net":{"conversation":"tag:gnusocial.jp,2025-11-04:objectType=thread:nonce=eb1a2f74ff969cb5","notice_info":{"local_id":"11460433","source":"ActivityPub","repeat_of":"11447890"}},"published":"2025-11-06T01:57:01+00:00","provider":{"objectType":"service","displayName":"GNU social JP","url":"https:\/\/gnusocial.jp\/"},"title":"blaise repeated a notice by johncarlosbaez","verb":"share","url":"https:\/\/hachyderm.io\/users\/blaise\/statuses\/115500266347141711\/activity"},{"actor":{"id":"https:\/\/hachyderm.io\/users\/blaise","displayName":"Blaise Pab\u00f3n - controlpl4n3","status_net":{"avatarLinks":[{"url":"https:\/\/gnusocial.jp\/avatar\/36622-original-tmp20230620024809.webp","rel":"avatar","type":"image\/webp","width":400,"height":400},{"url":"https:\/\/gnusocial.jp\/avatar\/36622-96-20240126201842.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},{"url":"https:\/\/gnusocial.jp\/avatar\/36622-48-20240126201842.webp","rel":"avatar","type":"image\/webp","width":48,"height":48},{"url":"https:\/\/gnusocial.jp\/avatar\/36622-24-20240126201842.webp","rel":"avatar","type":"image\/webp","width":24,"height":24}],"profile_info":{"local_id":"36622"}},"image":{"url":"https:\/\/gnusocial.jp\/avatar\/36622-96-20240126201842.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},"objectType":"person","summary":"Open Source Apothecary, Internet Elder\ud83c\uddfa\ud83c\uddf8 \ud83c\uddea\ud83c\uddf8 \ud83c\uddf5\ud83c\uddf7 \ud83c\uddf2\ud83c\uddfd \ud83c\uddef\ud83c\uddf5 and back again.#ADHD #autism #bass player #boricua #ComplexityWranglers #coop #fountainpens #HamRadio #mycology #Sanskrit #neurodivergence #yogaFollow @blaise for steady boosts of #OpenSource, #python","url":"https:\/\/hachyderm.io\/@blaise","portablecontacts_net":{"preferredUsername":"blaise","displayName":"Blaise Pab\u00f3n - controlpl4n3","note":"Open Source Apothecary, Internet Elder\ud83c\uddfa\ud83c\uddf8 \ud83c\uddea\ud83c\uddf8 \ud83c\uddf5\ud83c\uddf7 \ud83c\uddf2\ud83c\uddfd \ud83c\uddef\ud83c\uddf5 and back again.#ADHD #autism #bass player #boricua #ComplexityWranglers #coop #fountainpens #HamRadio #mycology #Sanskrit #neurodivergence #yogaFollow @blaise for steady boosts of #OpenSource, #python"}},"content":"RT @blaise In 1934, Fermi started trying to produce "transuranics" - elements above uranium - by firing neutron beams at uranium. Meitner got excited about this and began doing the same with Hahn and another chemist, Fritz Strassman. They seemed to be succeeding, but the results were bizarre: the new elements seemed to decay in many different ways! Their chemical properties were curiously variable as well. And the more experiments the team did, the stranger their results got.No<\/a> doubt this is part of why Meitner took so long to flee Germany. Another reason was her difficulty in finding a job. For a while she was protected somewhat by her Austrian citizenship, but that ended in 1938 when Hitler annexed Austria. After many difficulties, she found an academic position in Stockholm and managed to sneak out of Germany using a no-longer-valid Austria passport.She was now 60. She had been the head of a laboratory in Berlin, constantly discussing physics with all the top scientists. Now she was in a country where she couldn't speak the language. She was given a small room to use a lab, but essentially no equipment, and no assistants. She started making her own equipment. Hahn continued work with Strassman in Berlin, and Meitner attempted to collaborate from afar, but Hahn stopped citing her contributions, for fear of the Nazis and their hatred of "decadent Jewish scence". Meitner complained about this to him. He accused her of being unsympathetic to *his* plight.(5\/n)","generator":{"id":"tag:gnusocial.jp,2026-08-16:notice-source:ActivityPub","objectType":"application","status_net":{"source_code":"ActivityPub"}},"id":"https:\/\/hachyderm.io\/users\/blaise\/statuses\/115500262290545432\/activity","object":{"id":"https:\/\/mathstodon.xyz\/users\/johncarlosbaez\/statuses\/115490754805612867","objectType":"note","content":" Meitner's discovery - that the electrons produced in \u03b2 decay when neutrons decay into protons don't have a single specific energy but rather a range of energies - led to a crisis in nuclear physics around 1929. <\/p> Bohr decided that the only way out was a failure of conservation of energy! Maybe it was only conserved on average. Pauli thought of a slightly less radical way out: in \u03b2 decay, maybe some of the energy is carried off by yet another neutral particle, this time one of low mass. <\/p> Two mysterious unseen neutral particles was a lot to stomach! In 1931 Fermi called the big one the \"neutron\" and the little one the \"neutrino\". In 1932 Chadwick realized that you could create beams of neutrons by hitting beryllium with \u03b1 particles. The neutrino was only seen much later, in the 1950s. <\/p> (I hope people remember this story when they scoff at the notion that \"dark matter\" makes up most of the universe: even if something is hard to see, it might still exist.) <\/p> Back to Meitner:<\/p> When Hitler gained power over Germany in 1933, her life became increasingly tough, especially because she was a Jew. In May of that year, Nazi students at her university set fire to books by undesirable writers such as Mann, Kafka, and Einstein. <\/p> By September, Meitner received a letter saying she was dismissed from her professorship. Nonetheless, she continued to do research.<\/p> (4\/n)<\/p>","url":"https:\/\/mathstodon.xyz\/@johncarlosbaez\/115490754805612867","status_net":{"notice_id":null}},"to":[{"objectType":"http:\/\/activitystrea.ms\/schema\/1.0\/collection","id":"http:\/\/activityschema.org\/collection\/public"}],"status_net":{"conversation":"tag:gnusocial.jp,2025-11-04:objectType=thread:nonce=eb1a2f74ff969cb5","notice_info":{"local_id":"11460430","source":"ActivityPub","repeat_of":"11447889"}},"published":"2025-11-06T01:56:05+00:00","provider":{"objectType":"service","displayName":"GNU social JP","url":"https:\/\/gnusocial.jp\/"},"title":"blaise repeated a notice by johncarlosbaez","verb":"share","url":"https:\/\/hachyderm.io\/users\/blaise\/statuses\/115500262290545432\/activity"},{"actor":{"id":"https:\/\/hachyderm.io\/users\/blaise","displayName":"Blaise Pab\u00f3n - controlpl4n3","status_net":{"avatarLinks":[{"url":"https:\/\/gnusocial.jp\/avatar\/36622-original-tmp20230620024809.webp","rel":"avatar","type":"image\/webp","width":400,"height":400},{"url":"https:\/\/gnusocial.jp\/avatar\/36622-96-20240126201842.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},{"url":"https:\/\/gnusocial.jp\/avatar\/36622-48-20240126201842.webp","rel":"avatar","type":"image\/webp","width":48,"height":48},{"url":"https:\/\/gnusocial.jp\/avatar\/36622-24-20240126201842.webp","rel":"avatar","type":"image\/webp","width":24,"height":24}],"profile_info":{"local_id":"36622"}},"image":{"url":"https:\/\/gnusocial.jp\/avatar\/36622-96-20240126201842.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},"objectType":"person","summary":"Open Source Apothecary, Internet Elder\ud83c\uddfa\ud83c\uddf8 \ud83c\uddea\ud83c\uddf8 \ud83c\uddf5\ud83c\uddf7 \ud83c\uddf2\ud83c\uddfd \ud83c\uddef\ud83c\uddf5 and back again.#ADHD #autism #bass player #boricua #ComplexityWranglers #coop #fountainpens #HamRadio #mycology #Sanskrit #neurodivergence #yogaFollow @blaise for steady boosts of #OpenSource, #python","url":"https:\/\/hachyderm.io\/@blaise","portablecontacts_net":{"preferredUsername":"blaise","displayName":"Blaise Pab\u00f3n - controlpl4n3","note":"Open Source Apothecary, Internet Elder\ud83c\uddfa\ud83c\uddf8 \ud83c\uddea\ud83c\uddf8 \ud83c\uddf5\ud83c\uddf7 \ud83c\uddf2\ud83c\uddfd \ud83c\uddef\ud83c\uddf5 and back again.#ADHD #autism #bass player #boricua #ComplexityWranglers #coop #fountainpens #HamRadio #mycology #Sanskrit #neurodivergence #yogaFollow @blaise for steady boosts of #OpenSource, #python"}},"content":"RT @blaise In 1914 Rutherford referred to the hydrogen nucleus as a "positive electron". In 1920 he coined the term "proton". But the real problem was that nobody knew about neutrons! Instead, people guessed that the nucleus consisted of protons and "nuclear electrons", which made its charge differ from the atomic mass. But it was completely mysterious why these nuclear electrons should act different from the others: as Bohr put it, they showed a "remarkable passivity". They didn't even have any spin angular momentum! But on the other hand, they certainly seemed to exist - since sometimes they would shoot out in the form of \u03b2 radiation! To solve this puzzle one needed to postulate a neutral particle as heavy as a proton and invent a theory of \u03b2 decay in which this particle could decay into a proton while emitting an electron. But there was an additional complication: unlike \u03b1 radiation, which had a definite energy, \u03b2 radiation had a continuous spectrum of energies. Meitner didn't believe this at first, but eventually her careful experiments forced her and everyone else to admit it was true. The energy bookkeeping just didn't add up properly!(3\/n)","generator":{"id":"tag:gnusocial.jp,2026-08-16:notice-source:ActivityPub","objectType":"application","status_net":{"source_code":"ActivityPub"}},"id":"https:\/\/hachyderm.io\/users\/blaise\/statuses\/115500258260137387\/activity","object":{"id":"https:\/\/mathstodon.xyz\/users\/johncarlosbaez\/statuses\/115490717300718406","objectType":"note","content":" Here you can see what Meitner was studying: the decay chain that produces first actinium and eventually lead. All the nuclei in this decay chain have atomic mass 4n+3. The reason: <\/p> \u2022 In \"\u03b1 decay\" a nucleus emits a helium nucleus or \"\u03b1 particle\" - 2 protons and 2 neutrons - so its atomic number goes down by 2 and its atomic mass goes down by 4. <\/p> \u2022 In \"\u03b2 decay\" a neutron decays into a proton and emits a neutrino and an electron, or \"\u03b2 particle\", so its atomic number goes up by 1 and its atomic mass stays the same.<\/p> But to understand Meitner's work in context, you have to realize that these facts only became clear through painstaking work and brilliant leaps of intuition! Much of the work was done by her team in Berlin, Marie and Pierre Curie in France, Ernest Rutherford's group in Manchester and later Cambridge, and eventually Enrico Fermi's group in Rome.<\/p> At first people thought electrons were bound in a nondescript jelly of positive charge - Thomson's \"plum pudding\" atom. Even when Rutherford, Geiger and Marsden shot \u03b1 particles at atoms in 1909 and learned from how they bounced back that the positive charge was concentrated in a small \"nucleus\", there remained the puzzle of what this nucleus was! <\/p> (2\/n)<\/p>","url":"https:\/\/mathstodon.xyz\/@johncarlosbaez\/115490717300718406","status_net":{"notice_id":null}},"to":[{"objectType":"http:\/\/activitystrea.ms\/schema\/1.0\/collection","id":"http:\/\/activityschema.org\/collection\/public"}],"status_net":{"conversation":"tag:gnusocial.jp,2025-11-04:objectType=thread:nonce=eb1a2f74ff969cb5","notice_info":{"local_id":"11460425","source":"ActivityPub","repeat_of":"11447887"}},"published":"2025-11-06T01:55:33+00:00","provider":{"objectType":"service","displayName":"GNU social JP","url":"https:\/\/gnusocial.jp\/"},"title":"blaise repeated a notice by johncarlosbaez","verb":"share","url":"https:\/\/hachyderm.io\/users\/blaise\/statuses\/115500258260137387\/activity"},{"actor":{"id":"https:\/\/hachyderm.io\/users\/blaise","displayName":"Blaise Pab\u00f3n - controlpl4n3","status_net":{"avatarLinks":[{"url":"https:\/\/gnusocial.jp\/avatar\/36622-original-tmp20230620024809.webp","rel":"avatar","type":"image\/webp","width":400,"height":400},{"url":"https:\/\/gnusocial.jp\/avatar\/36622-96-20240126201842.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},{"url":"https:\/\/gnusocial.jp\/avatar\/36622-48-20240126201842.webp","rel":"avatar","type":"image\/webp","width":48,"height":48},{"url":"https:\/\/gnusocial.jp\/avatar\/36622-24-20240126201842.webp","rel":"avatar","type":"image\/webp","width":24,"height":24}],"profile_info":{"local_id":"36622"}},"image":{"url":"https:\/\/gnusocial.jp\/avatar\/36622-96-20240126201842.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},"objectType":"person","summary":"Open Source Apothecary, Internet Elder\ud83c\uddfa\ud83c\uddf8 \ud83c\uddea\ud83c\uddf8 \ud83c\uddf5\ud83c\uddf7 \ud83c\uddf2\ud83c\uddfd \ud83c\uddef\ud83c\uddf5 and back again.#ADHD #autism #bass player #boricua #ComplexityWranglers #coop #fountainpens #HamRadio #mycology #Sanskrit #neurodivergence #yogaFollow @blaise for steady boosts of #OpenSource, #python","url":"https:\/\/hachyderm.io\/@blaise","portablecontacts_net":{"preferredUsername":"blaise","displayName":"Blaise Pab\u00f3n - controlpl4n3","note":"Open Source Apothecary, Internet Elder\ud83c\uddfa\ud83c\uddf8 \ud83c\uddea\ud83c\uddf8 \ud83c\uddf5\ud83c\uddf7 \ud83c\uddf2\ud83c\uddfd \ud83c\uddef\ud83c\uddf5 and back again.#ADHD #autism #bass player #boricua #ComplexityWranglers #coop #fountainpens #HamRadio #mycology #Sanskrit #neurodivergence #yogaFollow @blaise for steady boosts of #OpenSource, #python"}},"content":"RT @blaise Meitner's discovery - that the electrons produced in \u03b2 decay when neutrons decay into protons don't have a single specific energy but rather a range of energies - led to a crisis in nuclear physics around 1929. Bohr decided that the only way out was a failure of conservation of energy! Maybe it was only conserved on average. Pauli thought of a slightly less radical way out: in \u03b2 decay, maybe some of the energy is carried off by yet another neutral particle, this time one of low mass. Two mysterious unseen neutral particles was a lot to stomach! In 1931 Fermi called the big one the "neutron" and the little one the "neutrino". In 1932 Chadwick realized that you could create beams of neutrons by hitting beryllium with \u03b1 particles. The neutrino was only seen much later, in the 1950s. (I hope people remember this story when they scoff at the notion that "dark matter" makes up most of the universe: even if something is hard to see, it might still exist.) Back to Meitner:When Hitler gained power over Germany in 1933, her life became increasingly tough, especially because she was a Jew. In May of that year, Nazi students at her university set fire to books by undesirable writers such as Mann, Kafka, and Einstein. By September, Meitner received a letter saying she was dismissed from her professorship. Nonetheless, she continued to do research.(4\/n)","generator":{"id":"tag:gnusocial.jp,2026-08-16:notice-source:ActivityPub","objectType":"application","status_net":{"source_code":"ActivityPub"}},"id":"https:\/\/hachyderm.io\/users\/blaise\/statuses\/115500258701887448\/activity","object":{"id":"https:\/\/mathstodon.xyz\/users\/johncarlosbaez\/statuses\/115490730530365008","objectType":"note","content":" In 1914 Rutherford referred to the hydrogen nucleus as a \"positive electron\". In 1920 he coined the term \"proton\". But the real problem was that nobody knew about neutrons! <\/p> Instead, people guessed that the nucleus consisted of protons and \"nuclear electrons\", which made its charge differ from the atomic mass. But it was completely mysterious why these nuclear electrons should act different from the others: as Bohr put it, they showed a \"remarkable passivity\". They didn't even have any spin angular momentum! But on the other hand, they certainly seemed to exist - since sometimes they would shoot out in the form of \u03b2 radiation! <\/p> To solve this puzzle one needed to postulate a neutral particle as heavy as a proton and invent a theory of \u03b2 decay in which this particle could decay into a proton while emitting an electron. But there was an additional complication: unlike \u03b1 radiation, which had a definite energy, \u03b2 radiation had a continuous spectrum of energies. <\/p> Meitner didn't believe this at first, but eventually her careful experiments forced her and everyone else to admit it was true. The energy bookkeeping just didn't add up properly!<\/p> (3\/n)<\/p>","url":"https:\/\/mathstodon.xyz\/@johncarlosbaez\/115490730530365008","status_net":{"notice_id":null}},"to":[{"objectType":"http:\/\/activitystrea.ms\/schema\/1.0\/collection","id":"http:\/\/activityschema.org\/collection\/public"}],"status_net":{"conversation":"tag:gnusocial.jp,2025-11-04:objectType=thread:nonce=eb1a2f74ff969cb5","notice_info":{"local_id":"11460422","source":"ActivityPub","repeat_of":"11447888"}},"published":"2025-11-06T01:55:07+00:00","provider":{"objectType":"service","displayName":"GNU social JP","url":"https:\/\/gnusocial.jp\/"},"title":"blaise repeated a notice by johncarlosbaez","verb":"share","url":"https:\/\/hachyderm.io\/users\/blaise\/statuses\/115500258701887448\/activity"},{"actor":{"id":"https:\/\/mathstodon.xyz\/users\/johncarlosbaez","displayName":"John Carlos Baez","status_net":{"avatarLinks":[{"url":"https:\/\/gnusocial.jp\/avatar\/83718-original-tmp20250418072433.webp","rel":"avatar","type":"image\/webp","width":400,"height":400},{"url":"https:\/\/gnusocial.jp\/avatar\/83718-96-20250418093131.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},{"url":"https:\/\/gnusocial.jp\/avatar\/83718-48-20250418093131.webp","rel":"avatar","type":"image\/webp","width":48,"height":48},{"url":"https:\/\/gnusocial.jp\/avatar\/83718-24-20250418120427.webp","rel":"avatar","type":"image\/webp","width":24,"height":24}],"profile_info":{"local_id":"83718"}},"image":{"url":"https:\/\/gnusocial.jp\/avatar\/83718-96-20250418093131.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},"objectType":"person","summary":"I'm a mathematical physicist who likes explaining stuff. I'm the Maxwell Fellow of Public Engagement at the School of Mathematics and the School of Physics and Astronomy at the University of Edinburgh. Check out my blog Azimuth! I'm also a member of the n-Category Caf\u00e9, a group blog on math with an emphasis on category theory. I also have a YouTube channel, full of talks about math, physics and the future.","url":"https:\/\/mathstodon.xyz\/@johncarlosbaez","portablecontacts_net":{"preferredUsername":"johncarlosbaez","displayName":"John Carlos Baez","note":"I'm a mathematical physicist who likes explaining stuff. I'm the Maxwell Fellow of Public Engagement at the School of Mathematics and the School of Physics and Astronomy at the University of Edinburgh. Check out my blog Azimuth! I'm also a member of the n-Category Caf\u00e9, a group blog on math with an emphasis on category theory. I also have a YouTube channel, full of talks about math, physics and the future."}},"content":" I won't bother telling the story of all that happened next: the calculations and experiments confirming that uranium really was splitting into lighter nuclei, the development of the atomic bomb, which Meitner refused to participate in, how she was nonetheless hailed as the \"Jewish mother of the bomb\" when she came to America in 1946 - and how Hahn alone got the Nobel prize for fission, also in 1946.<\/p> It's particularly irksome how Hahn seemed to claim all the credit for himself in his later years. But history has dealt him a bit of poetic justice. Element 105 was tentatively called \"hahnium\" by a team of scientists at Berkeley who produced it, but later, the International Union of Pure and Applied Chemistry decreed that it be dubbed \"dubnium\" - after Dubna, where a Russian team also made this element. <\/p> To prevent confusion, no other element can now be called \"hahnium\". But element 109 is called \"meitnerium\". <\/p> For more, I highly recommend this biography:<\/p> \u2022 Ruth Sime, Lise Meitner: A Life in Physics, University of California Press, 1997. <\/p> (n\/7, n = 7)<\/p>","generator":{"id":"tag:gnusocial.jp,2026-08-16:notice-source:ActivityPub","objectType":"application","status_net":{"source_code":"ActivityPub"}},"id":"https:\/\/mathstodon.xyz\/users\/johncarlosbaez\/statuses\/115490812639305991","object":{"id":"https:\/\/mathstodon.xyz\/users\/johncarlosbaez\/statuses\/115490812639305991","objectType":"note","content":" I won't bother telling the story of all that happened next: the calculations and experiments confirming that uranium really was splitting into lighter nuclei, the development of the atomic bomb, which Meitner refused to participate in, how she was nonetheless hailed as the \"Jewish mother of the bomb\" when she came to America in 1946 - and how Hahn alone got the Nobel prize for fission, also in 1946.<\/p> It's particularly irksome how Hahn seemed to claim all the credit for himself in his later years. But history has dealt him a bit of poetic justice. Element 105 was tentatively called \"hahnium\" by a team of scientists at Berkeley who produced it, but later, the International Union of Pure and Applied Chemistry decreed that it be dubbed \"dubnium\" - after Dubna, where a Russian team also made this element. <\/p> To prevent confusion, no other element can now be called \"hahnium\". But element 109 is called \"meitnerium\". <\/p> For more, I highly recommend this biography:<\/p> \u2022 Ruth Sime, Lise Meitner: A Life in Physics, University of California Press, 1997. <\/p> (n\/7, n = 7)<\/p>","url":"https:\/\/mathstodon.xyz\/@johncarlosbaez\/115490812639305991","status_net":{"notice_id":null},"inReplyTo":{"objectType":"note","id":"https:\/\/mathstodon.xyz\/users\/johncarlosbaez\/statuses\/115490788701067261","url":"https:\/\/mathstodon.xyz\/@johncarlosbaez\/115490788701067261"}},"to":[{"objectType":"http:\/\/activitystrea.ms\/schema\/1.0\/collection","id":"http:\/\/activityschema.org\/collection\/public"}],"status_net":{"conversation":"tag:gnusocial.jp,2025-11-04:objectType=thread:nonce=eb1a2f74ff969cb5","notice_info":{"local_id":"11457101","source":"ActivityPub"}},"published":"2025-11-05T15:37:46+00:00","provider":{"objectType":"service","displayName":"GNU social JP","url":"https:\/\/gnusocial.jp\/"},"verb":"post","url":"https:\/\/mathstodon.xyz\/@johncarlosbaez\/115490812639305991"},{"actor":{"id":"https:\/\/mathstodon.xyz\/users\/johncarlosbaez","displayName":"John Carlos Baez","status_net":{"avatarLinks":[{"url":"https:\/\/gnusocial.jp\/avatar\/83718-original-tmp20250418072433.webp","rel":"avatar","type":"image\/webp","width":400,"height":400},{"url":"https:\/\/gnusocial.jp\/avatar\/83718-96-20250418093131.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},{"url":"https:\/\/gnusocial.jp\/avatar\/83718-48-20250418093131.webp","rel":"avatar","type":"image\/webp","width":48,"height":48},{"url":"https:\/\/gnusocial.jp\/avatar\/83718-24-20250418120427.webp","rel":"avatar","type":"image\/webp","width":24,"height":24}],"profile_info":{"local_id":"83718"}},"image":{"url":"https:\/\/gnusocial.jp\/avatar\/83718-96-20250418093131.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},"objectType":"person","summary":"I'm a mathematical physicist who likes explaining stuff. I'm the Maxwell Fellow of Public Engagement at the School of Mathematics and the School of Physics and Astronomy at the University of Edinburgh. Check out my blog Azimuth! I'm also a member of the n-Category Caf\u00e9, a group blog on math with an emphasis on category theory. I also have a YouTube channel, full of talks about math, physics and the future.","url":"https:\/\/mathstodon.xyz\/@johncarlosbaez","portablecontacts_net":{"preferredUsername":"johncarlosbaez","displayName":"John Carlos Baez","note":"I'm a mathematical physicist who likes explaining stuff. I'm the Maxwell Fellow of Public Engagement at the School of Mathematics and the School of Physics and Astronomy at the University of Edinburgh. Check out my blog Azimuth! I'm also a member of the n-Category Caf\u00e9, a group blog on math with an emphasis on category theory. I also have a YouTube channel, full of talks about math, physics and the future."}},"content":" @BashStKid<\/a> - thanks, I don't know about Kobo but I would like UK-friendly alternatives to Amazon for books.<\/p>","generator":{"id":"tag:gnusocial.jp,2026-08-16:notice-source:ActivityPub","objectType":"application","status_net":{"source_code":"ActivityPub"}},"id":"https:\/\/mathstodon.xyz\/users\/johncarlosbaez\/statuses\/115497816979354679","object":{"id":"https:\/\/mathstodon.xyz\/users\/johncarlosbaez\/statuses\/115497816979354679","objectType":"note","content":" @BashStKid<\/a> - thanks, I don't know about Kobo but I would like UK-friendly alternatives to Amazon for books.<\/p>","url":"https:\/\/mathstodon.xyz\/@johncarlosbaez\/115497816979354679","status_net":{"notice_id":null},"inReplyTo":{"objectType":"note","id":"https:\/\/mastodon.online\/users\/BashStKid\/statuses\/115497689542384256","url":"https:\/\/mastodon.online\/@BashStKid\/115497689542384256"}},"to":[{"objectType":"http:\/\/activitystrea.ms\/schema\/1.0\/person","id":"https:\/\/mastodon.online\/users\/BashStKid"},{"objectType":"http:\/\/activitystrea.ms\/schema\/1.0\/collection","id":"http:\/\/activityschema.org\/collection\/public"}],"status_net":{"conversation":"tag:gnusocial.jp,2025-11-04:objectType=thread:nonce=eb1a2f74ff969cb5","notice_info":{"local_id":"11457104","source":"ActivityPub"}},"published":"2025-11-05T15:37:45+00:00","provider":{"objectType":"service","displayName":"GNU social JP","url":"https:\/\/gnusocial.jp\/"},"verb":"post","url":"https:\/\/mathstodon.xyz\/@johncarlosbaez\/115497816979354679"},{"actor":{"id":"https:\/\/mastodon.online\/users\/BashStKid","displayName":"BashStKid","status_net":{"avatarLinks":[{"url":"https:\/\/gnusocial.jp\/avatar\/178886-original-tmp20230924230820.webp","rel":"avatar","type":"image\/webp","width":370,"height":370},{"url":"https:\/\/gnusocial.jp\/avatar\/178886-96-20230926124142.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},{"url":"https:\/\/gnusocial.jp\/avatar\/178886-48-20230926124142.webp","rel":"avatar","type":"image\/webp","width":48,"height":48},{"url":"https:\/\/gnusocial.jp\/avatar\/178886-24-20230926124142.webp","rel":"avatar","type":"image\/webp","width":24,"height":24}],"profile_info":{"local_id":"178886"}},"image":{"url":"https:\/\/gnusocial.jp\/avatar\/178886-96-20230926124142.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},"objectType":"person","summary":"\u201cWe can only see a short distance ahead, but we can see plenty there that needs to be done\u201d Various permutations of rugby, music, history, farming, rare breeds, food. With a bit of earth sciences, physics, and energy.","url":"https:\/\/mastodon.online\/@BashStKid","portablecontacts_net":{"preferredUsername":"BashStKid","displayName":"BashStKid","note":"\u201cWe can only see a short distance ahead, but we can see plenty there that needs to be done\u201d Various permutations of rugby, music, history, farming, rare breeds, food. With a bit of earth sciences, physics, and energy."}},"content":" @johncarlosbaez<\/a> The only thing I can add is that it\u2019s available on Kobo for \u00a317, which is the cheapest I can find it that\u2019s not on Amazon.<\/p>","generator":{"id":"tag:gnusocial.jp,2026-08-16:notice-source:ActivityPub","objectType":"application","status_net":{"source_code":"ActivityPub"}},"id":"https:\/\/mastodon.online\/users\/BashStKid\/statuses\/115497689542384256","object":{"id":"https:\/\/mastodon.online\/users\/BashStKid\/statuses\/115497689542384256","objectType":"note","content":" @johncarlosbaez<\/a> The only thing I can add is that it\u2019s available on Kobo for \u00a317, which is the cheapest I can find it that\u2019s not on Amazon.<\/p>","url":"https:\/\/mastodon.online\/@BashStKid\/115497689542384256","status_net":{"notice_id":null},"inReplyTo":{"objectType":"note","id":"https:\/\/mathstodon.xyz\/users\/johncarlosbaez\/statuses\/115490812639305991","url":"https:\/\/mathstodon.xyz\/@johncarlosbaez\/115490812639305991"}},"to":[{"objectType":"http:\/\/activitystrea.ms\/schema\/1.0\/person","id":"https:\/\/mathstodon.xyz\/users\/johncarlosbaez"},{"objectType":"http:\/\/activitystrea.ms\/schema\/1.0\/collection","id":"http:\/\/activityschema.org\/collection\/public"}],"status_net":{"conversation":"tag:gnusocial.jp,2025-11-04:objectType=thread:nonce=eb1a2f74ff969cb5","notice_info":{"local_id":"11457102","source":"ActivityPub"}},"published":"2025-11-05T15:37:45+00:00","provider":{"objectType":"service","displayName":"GNU social JP","url":"https:\/\/gnusocial.jp\/"},"verb":"post","url":"https:\/\/mastodon.online\/@BashStKid\/115497689542384256"},{"actor":{"id":"https:\/\/freesoftwareextremist.com\/users\/Suiseiseki","displayName":"\u7fe0\u661f\u77f3","status_net":{"avatarLinks":[{"url":"https:\/\/gnusocial.jp\/avatar\/789-96-20220724040913.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},{"url":"https:\/\/gnusocial.jp\/avatar\/789-48-20220724040913.webp","rel":"avatar","type":"image\/webp","width":48,"height":48},{"url":"https:\/\/gnusocial.jp\/avatar\/789-24-20220724040913.webp","rel":"avatar","type":"image\/webp","width":24,"height":24}],"profile_info":{"local_id":"789"}},"image":{"url":"https:\/\/gnusocial.jp\/avatar\/789-96-20220724040913.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},"objectType":"person","summary":"[[[ To any NSA, CIA & FBI agents reading my profile; please consider ]]][[[ whether defending the US Constitution against all enemies, ]]][[[ foreign or domestic, requires you to follow Snowden's example. ]]]Free software extremist who enjoys freedom and posting \u3067\u3059\u3045.Please don't confuse me with an "open source" supporter \u3067\u3059\u3045.GNU+Jihad against proprietary and "open source" software \u3067\u3059\u3045\u3045\u3045\u3045\u3045\u3045!!!\u24d8 User is the leader of an international terrorist organization.\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045??","url":"https:\/\/freesoftwareextremist.com\/users\/Suiseiseki","portablecontacts_net":{"preferredUsername":"Suiseiseki","displayName":"\u7fe0\u661f\u77f3","note":"[[[ To any NSA, CIA & FBI agents reading my profile; please consider ]]][[[ whether defending the US Constitution against all enemies, ]]][[[ foreign or domestic, requires you to follow Snowden's example. ]]]Free software extremist who enjoys freedom and posting \u3067\u3059\u3045.Please don't confuse me with an "open source" supporter \u3067\u3059\u3045.GNU+Jihad against proprietary and "open source" software \u3067\u3059\u3045\u3045\u3045\u3045\u3045\u3045!!!\u24d8 User is the leader of an international terrorist organization.\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045\u3067\u3059\u3045??"}},"content":"@johncarlosbaez<\/a> @BashStKid<\/a> Certain Kobo readers have BusyBox\/Linux ports available for them as Kobo partially compiles with the GPLv2 for Linux.
https:\/\/engelsbergideas.com\/notebook\/what-if-bach-and-handel-had-met\/<\/a>.<\/p>","url":"https:\/\/mathstodon.xyz\/@metaweta\/115498882326371016","status_net":{"notice_id":null}},"to":[{"objectType":"http:\/\/activitystrea.ms\/schema\/1.0\/collection","id":"http:\/\/activityschema.org\/collection\/public"}],"status_net":{"conversation":"tag:gnusocial.jp,2025-11-04:objectType=thread:nonce=eb1a2f74ff969cb5","notice_info":{"local_id":"11460443","source":"ActivityPub","repeat_of":"11460441"}},"published":"2025-11-06T01:59:12+00:00","provider":{"objectType":"service","displayName":"GNU social JP","url":"https:\/\/gnusocial.jp\/"},"title":"blaise repeated a notice by metaweta","verb":"share","url":"https:\/\/hachyderm.io\/users\/blaise\/statuses\/115500273836130191\/activity"},{"actor":{"id":"https:\/\/mathstodon.xyz\/users\/metaweta","displayName":"Mike Stay","status_net":{"avatarLinks":[{"url":"https:\/\/gnusocial.jp\/avatar\/316790-original-tmp20250115191433.webp","rel":"avatar","type":"image\/webp","width":47,"height":47},{"url":"https:\/\/gnusocial.jp\/avatar\/316790-96-20250124204516.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},{"url":"https:\/\/gnusocial.jp\/avatar\/316790-48-20251106015906.webp","rel":"avatar","type":"image\/webp","width":48,"height":48},{"url":"https:\/\/gnusocial.jp\/avatar\/316790-24-20251106015906.webp","rel":"avatar","type":"image\/webp","width":24,"height":24}],"profile_info":{"local_id":"316790"}},"image":{"url":"https:\/\/gnusocial.jp\/avatar\/316790-96-20250124204516.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},"objectType":"person","summary":"Director of R&D at F1R3FLY.io. Interests: functional programming, quantum computation, machine learning, cryptography, cryptocurrency, cryptanalysis, n-cats, art quilts, etymology, sci fi, weird flora & fauna, ocaps, algorithmic information theory, philosophy, geology, gothic architecture, \u2026","url":"https:\/\/mathstodon.xyz\/@metaweta","portablecontacts_net":{"preferredUsername":"metaweta","displayName":"Mike Stay","note":"Director of R&D at F1R3FLY.io. Interests: functional programming, quantum computation, machine learning, cryptography, cryptocurrency, cryptanalysis, n-cats, art quilts, etymology, sci fi, weird flora & fauna, ocaps, algorithmic information theory, philosophy, geology, gothic architecture, \u2026"}},"content":"
https:\/\/engelsbergideas.com\/notebook\/what-if-bach-and-handel-had-met\/<\/a>.<\/p>","generator":{"id":"tag:gnusocial.jp,2026-08-16:notice-source:ActivityPub","objectType":"application","status_net":{"source_code":"ActivityPub"}},"id":"https:\/\/mathstodon.xyz\/users\/metaweta\/statuses\/115498882326371016","object":{"id":"https:\/\/mathstodon.xyz\/users\/metaweta\/statuses\/115498882326371016","objectType":"note","content":"
https:\/\/engelsbergideas.com\/notebook\/what-if-bach-and-handel-had-met\/<\/a>.<\/p>","url":"https:\/\/mathstodon.xyz\/@metaweta\/115498882326371016","status_net":{"notice_id":null},"inReplyTo":{"objectType":"note","id":"https:\/\/mathstodon.xyz\/users\/johncarlosbaez\/statuses\/115491275936428364","url":"https:\/\/mathstodon.xyz\/@johncarlosbaez\/115491275936428364"}},"to":[{"objectType":"http:\/\/activitystrea.ms\/schema\/1.0\/person","id":"https:\/\/mathstodon.xyz\/users\/johncarlosbaez"},{"objectType":"http:\/\/activitystrea.ms\/schema\/1.0\/person","id":"https:\/\/mathstodon.xyz\/users\/j_bertolotti"},{"objectType":"http:\/\/activitystrea.ms\/schema\/1.0\/collection","id":"http:\/\/activityschema.org\/collection\/public"}],"status_net":{"conversation":"tag:gnusocial.jp,2025-11-04:objectType=thread:nonce=eb1a2f74ff969cb5","notice_info":{"local_id":"11460441","source":"ActivityPub"}},"published":"2025-11-06T01:59:06+00:00","provider":{"objectType":"service","displayName":"GNU social JP","url":"https:\/\/gnusocial.jp\/"},"verb":"post","url":"https:\/\/mathstodon.xyz\/@metaweta\/115498882326371016"},{"actor":{"id":"https:\/\/mathstodon.xyz\/users\/johncarlosbaez","displayName":"John Carlos Baez","status_net":{"avatarLinks":[{"url":"https:\/\/gnusocial.jp\/avatar\/83718-original-tmp20250418072433.webp","rel":"avatar","type":"image\/webp","width":400,"height":400},{"url":"https:\/\/gnusocial.jp\/avatar\/83718-96-20250418093131.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},{"url":"https:\/\/gnusocial.jp\/avatar\/83718-48-20250418093131.webp","rel":"avatar","type":"image\/webp","width":48,"height":48},{"url":"https:\/\/gnusocial.jp\/avatar\/83718-24-20250418120427.webp","rel":"avatar","type":"image\/webp","width":24,"height":24}],"profile_info":{"local_id":"83718"}},"image":{"url":"https:\/\/gnusocial.jp\/avatar\/83718-96-20250418093131.webp","rel":"avatar","type":"image\/webp","width":96,"height":96},"objectType":"person","summary":"I'm a mathematical physicist who likes explaining stuff. I'm the Maxwell Fellow of Public Engagement at the School of Mathematics and the School of Physics and Astronomy at the University of Edinburgh. Check out my blog Azimuth! I'm also a member of the n-Category Caf\u00e9, a group blog on math with an emphasis on category theory. I also have a YouTube channel, full of talks about math, physics and the future.","url":"https:\/\/mathstodon.xyz\/@johncarlosbaez","portablecontacts_net":{"preferredUsername":"johncarlosbaez","displayName":"John Carlos Baez","note":"I'm a mathematical physicist who likes explaining stuff. I'm the Maxwell Fellow of Public Engagement at the School of Mathematics and the School of Physics and Astronomy at the University of Edinburgh. Check out my blog Azimuth! I'm also a member of the n-Category Caf\u00e9, a group blog on math with an emphasis on category theory. I also have a YouTube channel, full of talks about math, physics and the future."}},"content":"
For example; https:\/\/wiki.postmarketos.org\/wiki\/Kobo_Clara_HD_(kobo-clara)<\/a> can be used with AIR and free ebook software like KOReader with some fiddling - too bad postmarketOS is a proprietary distro and therefore contains proprietary software (full GNU\/Linux-libre freedom is possible provided proprietary Wi-Fi software isn't included).","generator":{"id":"tag:gnusocial.jp,2026-08-16:notice-source:ActivityPub","objectType":"application","status_net":{"source_code":"ActivityPub"}},"id":"https:\/\/freesoftwareextremist.com\/objects\/8c174511-958c-4c41-babb-849d16016c68","object":{"id":"https:\/\/freesoftwareextremist.com\/objects\/8c174511-958c-4c41-babb-849d16016c68","objectType":"note","content":"@johncarlosbaez<\/a> @BashStKid<\/a> Certain Kobo readers have BusyBox\/Linux ports available for them as Kobo partially compiles with the GPLv2 for Linux.
For example; https:\/\/wiki.postmarketos.org\/wiki\/Kobo_Clara_HD_(kobo-clara)<\/a> can be used with AIR and free ebook software like KOReader with some fiddling - too bad postmarketOS is a proprietary distro and therefore contains proprietary software (full GNU\/Linux-libre freedom is possible provided proprietary Wi-Fi software isn't included).","url":"https:\/\/freesoftwareextremist.com\/objects\/8c174511-958c-4c41-babb-849d16016c68","status_net":{"notice_id":null},"inReplyTo":{"objectType":"note","id":"https:\/\/mathstodon.xyz\/users\/johncarlosbaez\/statuses\/115497816979354679","url":"https:\/\/mathstodon.xyz\/@johncarlosbaez\/115497816979354679"}},"to":[{"objectType":"http:\/\/activitystrea.ms\/schema\/1.0\/person","id":"https:\/\/mathstodon.xyz\/users\/johncarlosbaez"},{"objectType":"http:\/\/activitystrea.ms\/schema\/1.0\/person","id":"https:\/\/mastodon.online\/users\/BashStKid"},{"objectType":"http:\/\/activitystrea.ms\/schema\/1.0\/collection","id":"http:\/\/activityschema.org\/collection\/public"}],"status_net":{"conversation":"tag:gnusocial.jp,2025-11-04:objectType=thread:nonce=eb1a2f74ff969cb5","notice_info":{"local_id":"11457105","source":"ActivityPub"}},"published":"2025-11-05T15:37:43+00:00","provider":{"objectType":"service","displayName":"GNU social JP","url":"https:\/\/gnusocial.jp\/"},"verb":"post","url":"https:\/\/freesoftwareextremist.com\/objects\/8c174511-958c-4c41-babb-849d16016c68"}],"links":[{"url":"https:\/\/gnusocial.jp\/conversation\/5829726","rel":"alternate","type":"text\/html"}]}