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TIL "placebo sleep": if you convince yourself that you slept well (even though you didn't), it tricks your brain into thinking that you did sleep well.

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OGB8L TIL the oldest plane still flying is a 1909 Bleriot Monoplane, made from wood tied together by fabric. The pilot sits in a wicker chair
lL17 TIL The Holocaust memorial in Berlin in coated with a special anti-graffiti chemical. The company that produced this chemical was the same company that produced Zyklon B during the war.
kJl5W TIL that both silver and copper were worthless when the silver currency entirely collapsed in the third century CE. The only things that could support the Roman economy at this point were gold and products in kind. In actuality, it was this that ended the economic crisis of the third century.
OrQX TIL Leonardo Da Vinci’s last words were: “I have offended God and mankind. My work did not reach the quality it should have.”
Wk9VA TIL Although he eventually received LASIK surgery to correct his sight, NBA great Horace Grant continued to wear his trademark goggles on the court after he had heard from parents that he had become an inspirational figure to children who wore eyeglasses.