- cross-posted to:
- science@lemmy.world
- videos@lemmy.world
- cross-posted to:
- science@lemmy.world
- videos@lemmy.world
The blue LED was supposed to be impossible—until a young engineer proposed a moonshot idea.
The blue LED was supposed to be impossible—until a young engineer proposed a moonshot idea.
/c/flashlight sends its regards
D4V2 x-ray edition when?