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TIL about YInMn Blue, the first non-organic shade of blue discovered in over 200 years. It was discovered partly by accident by Mas Subramanian, who is now looking for a similar non-toxic bright-red pigment.

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4k1LJ TIL the Ancient Greek ruler of Miletus, Histiaeus sent a message by shaving the head of his most trusted servant, "marking" the message on his scalp, then sending him once his hair had regrown, with the instruction, "When thou art come to Miletus, bid Aristagoras shave thy head, and look thereon."
wLQDE TIL that musician Moby claimed in his second memoir to have been in a relationship with actress Natalie Portman when she was 18. Portman denied it, saying “my recollection is a much older man being creepy with me when I just had graduated high school.” Moby canceled his book tour and apologized.
oywE TIL that in a gesture of solidarity with the starving troops in Stalingrad, the german commander, Kurt Zeitzler reduced his own rations to their level. After 2 weeks he had lost 26 pounds.
6EJ1J TIL You are 10 times more likely to get bitten by a New Yorker than a shark.
9wv7r TIL there's a real robotics company called Cyberdine and one of its robotic exeoskeleton suit is named HAL.