Notices by Stephen Brooks 🦆 (sjb@mstdn.io)

I understand now.

1 inch aperture Halbach dipole #magnet made of off-the-shelf permanent magnet cuboids and a 3D printed holder. This has a central field of 0.34 Tesla, would be 0.5 Tesla with more longitudinal slices. #physics #accelerators

#ESP32 backdoor. #security
https://www.bleepingcomputer.com/news/security/undocumented-backdoor-found-in-bluetooth-chip-used-by-a-billion-devices/

@splitshockvirus Add livestreaming to Starnix so we can watch you play truck simulation for 18 hours.

Scientists aiming to bring back woolly mammoth create woolly mice.
https://www.theguardian.com/science/2025/mar/04/genetically-modified-woolly-mice-mammoth

Europe spending a bit more on defence could go a long way given their population and GDP are larger than Russia:
https://fredblog.stlouisfed.org/2022/03/comparing-russia-and-the-european-union-gdp-and-population/

Europa Clipper flew by Mars for gravity assist today. #space #NASA
RT https://x.com/EuropaClipper/status/1895896076496089505

@splitshockvirus

@tedu @wolf480pl Never mind I thought it was this, in which optimisation might avoid a segfault completely:

int bar(struct foo *p) {
int py = p->y;
if (!p) {
return 0;
}
return py;
}

@tedu @wolf480pl My guess would be segfault, unless you optimise, in which case it'll put the calculation of py after the "if (!p)" thing and it'll work fine.

@wolf480pl @tedu I dunno about that. On older systems like DOS, *(int *)0 was valid and just read low memory.

@wolf480pl @tedu I don't think so. In fact I think I read an article saying NULL could be non-zero in certain implementations of <stdlib.h>! So properly you should do "if (p==NULL)" not "if (!p)".

@wolf480pl @tedu In the original C, NULL was just macro in <stdlib.h>, nothing more. C++ has "nullptr" which I believe comes with extra semantics.

For British citizens - you can sign this petition asking to stop companies disabling video games people have already bought.
#UK #gaming
https://petition.parliament.uk/petitions/702074/

@Inginsub 🔫🐵

Growing lettuce on the ISS.
#space #NASA
https://www.nasa.gov/missions/station/iss-research/space-gardens/

https://www.tomshardware.com/pc-components/cpus/amd-says-intels-horrible-product-is-causing-ryzen-9-9800x3d-shortages

Noticing articles that are 90% introduction and then end with "So what do we know about <article title>? Well, it's still a mystery."

@splitshockvirus Do you only have one IP address to choose from?

@splitshockvirus Ah! I can see how that would be annoying, not sure how they expect people to work around that (other than having the ISP's technician install the router).