› added 9 years ago

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TIL blue LEDs were not invented until the early 1990s, 30 years after red and green LEDs were invented.

Read more bbc.com

via ift.tt

vjxr TIL of the “double-tap” drone strike, where a drone attacks once, waits for people to gather to help survivors and then attacks the same spot again
awbLb Til that there are huge, diverse 'kelp forests' underwater stretching for thousands of miles, found around coastlines on every continent except Antarctica. Darwin said of their ecosystem "I can only compare these great aquatic forests with the terrestrial ones in the intertropical regions."
WAYo TIL The Offspring used to print & sell Napster t-shirts without permission
no89 TIL Daylight Savings doesn’t actually save electricity. It still exists because it helps the economy.
jevn TIL: Under the Third Reich, Aryan mothers who devoted their lives to having children were awarded the Ehrenkreuz der Deutschen Mutter (Mother’s Cross) and were respected civil servants who were saluted on the streets by Hitler’s Youth.