TIL the first Blue LED wasn't commercially available until 1989 and bright blue LEDs weren't available until 1993. en.wikipedia.org Submitted by j-merc23 t3_10w8qi9 on February 7, 2023 at 6:12 PM in todayilearned 69 comments 789
nVr78 t1_j7lsgyr wrote on February 7, 2023 at 6:53 PM Interesting.. so what you’re saying is that people back then could fall asleep immediately, even right after using their iPhones? Permalink 8 Anicron t1_j7nw54v wrote on February 8, 2023 at 3:39 AM Underrated Permalink Parent 2 [deleted] t1_j7lwoo0 wrote on February 7, 2023 at 7:21 PM [deleted] Permalink Parent 1
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