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TIL Avro Vulcan bomber pilots, on nuclear missions, would wear a standard black eyepatch to protect one eye from the flash of a nuclear bomb. Taking it off once they were blinded in the exposed eye.

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oRMx8 TIL the surprising history of Christmas trees
DQQVe TIL Pierre Curie exposed his own arm to radium salts for 10 hours. He studied the wound, which resembled a burn, day by day. After 52 days a permanent grey scar remained.
7rgYp TIL that builders of Japan's Nijō castle created squeaky floors to prevent ninja assassins from sneaking in. The floors were designed so that just the lightest step produced a clearly audible sound, warning guards that danger is approaching and forcing a ninja to abandon his plots for the night.
x6X9g TIL that Uber drivers have been assaulted (at least) 24,000 times between 2017 and 2020
x6erw TIL a Scottish widower seeking female companionship set 2,000 bottled messages adrift, but ceased the practice in response to public complaints and an investigation by the Scottish Environment Protection Agency.