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
rainwulf t1_j7tf6a9 wrote on February 9, 2023 at 7:15 AM I remember during a school trip to the science museum (i am 45 now) they had LEDs of all the colours at the time, and the blue one was like "woa" Permalink 2
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