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TIL Hawaiian shirts are called 'Aloha shirts' in Hawaii. More subdued versions are "considered formal wear in business and government and are thus regarded as equivalent to a shirt, coat, and tie". Everyone wears Hawaiian shirts to work every day.

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7e5r TIL the Olympic flame in 1976 traveled by radio waves to a laser that lit the cauldron.
N7MbQ TIL there was a book published in Einstein’s lifetime entitled “100 Authors Against Einstein” of which Einstein retorted, “if I were wrong, then one would have been enough!”
ADkDx TIL there was a study where men and women asked people on campus whether they would like to sleep with them. The women had a 75% success rate, the men had 0%
W7Nao TIL the BBC Micro has a resistor to simulate a human holding their finger on the circuit board. The computer doesn't work without it, and we still don't know why today.
a88nL TIL that the official Hitler sent to coerce fascist Spain into joining the Axis in WWII was secretly opposed to Nazism. Unsurprisingly, he did not convince Spain to join the war. After the war, the Spanish government gave his widow a pension in gratitude.