nVr78 t1_j7lsgyr wrote on February 7, 2023 at 6:53 PM Reply to TIL the first Blue LED wasn't commercially available until 1989 and bright blue LEDs weren't available until 1993. by j-merc23 Interesting.. so what you’re saying is that people back then could fall asleep immediately, even right after using their iPhones? Permalink 8
nVr78 t1_j7lsgyr wrote
Reply to TIL the first Blue LED wasn't commercially available until 1989 and bright blue LEDs weren't available until 1993. by j-merc23
Interesting.. so what you’re saying is that people back then could fall asleep immediately, even right after using their iPhones?