Conversation

Notices

1. Embed this notice
   Alex R :heart_progress: (alex@tech.lgbt)'s status on Tuesday, 23-May-2023 18:29:02 JST Alex R :heart_progress:

   in reply to

   • Ivan Sagalaev :flag_wbw:
   • James Dreben :mw:
   • lothar
   • Zeborah

   @isagalaev @lothar @zeborah @Jdreben it can sometimes! Bees can see in UV, which lets them see nectar better

   • clacke likes this.
   • Embed this notice
     Ivan Sagalaev :flag_wbw: (isagalaev@mastodon.social)'s status on Tuesday, 23-May-2023 18:29:03 JST Ivan Sagalaev :flag_wbw:

     in reply to

     • James Dreben :mw:
     • lothar
     • Zeborah

     @lothar @zeborah @Jdreben oh, I'm well aware of that one :-) But if UV vision was giving advantage, life would likely adopt that. I'm just trying to figure out why it doesn't (apparently) give any advantage.

     P.S. As for X-Ray and generally higher-than-UV energy radiation, the answer, I think, is pretty simple: it didn't exist on Earth in appreciable quantities until humans started producing those.

   • Embed this notice
     lothar (lothar@social.tchncs.de)'s status on Tuesday, 23-May-2023 18:29:10 JST lothar

     in reply to

     • Ivan Sagalaev :flag_wbw:
     • James Dreben :mw:
     • Zeborah

     @isagalaev
     Adding to that: For evolution, "good enough" is all that is required. There was no task "conceive a maximum-range detector with ideal resolution" or the like. Just about a little better then that of the competition would do. 😉
     @zeborah @Jdreben

   • Embed this notice
     Ivan Sagalaev :flag_wbw: (isagalaev@mastodon.social)'s status on Tuesday, 23-May-2023 18:29:11 JST Ivan Sagalaev :flag_wbw:

     in reply to

     • James Dreben :mw:
     • Zeborah

     @zeborah @Jdreben indeed! I missed that implication.

     Also, thinking further, UV (and up) becomes irrelevant, as at smaller wavelength it should scatter fast due to all the micro-stuff in the body of the water. On the other hand, scattering doesn't mean it's invisible. There should be plenty UV in the first 10 meters…

     Anyway, don't mind me, I'm just thinking aloud :-)

   • Embed this notice
     Zeborah (zeborah@mastodon.nz)'s status on Tuesday, 23-May-2023 18:29:17 JST Zeborah

     • James Dreben :mw:

     @isagalaev@mastodon.social @Jdreben Speculating: As the screencap notes, x-rays pass through flesh and only reflect off bones. If a jellyfish or octopus was transparent to you, you'd risk becoming their next meal.