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TIL Dark roast coffee has less caffeine than light roast coffee. The coffee beans lose more caffeine the more they are roasted.

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gM5jW TIL Physicians in the middle ages would drink their patients urine to diagnose medical conditions. They were able to accurately diagnose diabetes because the urine tasted sweet.
QNRrd TIL of the RP FLIP, an open ocean research vessel owned by the US Office of Naval Research. It is a one of a kind vessel capable of flipping orientation from horizontal to vertical by filling/emptying an incredibly long water reservoir.
p8oAp TIL that there's a cave in Romania that had been sealed off from the outside world for 5.5 million years and scientists have discovered dozens of unique lifeforms thriving in the poisonous gases and water.
1aaRV TIL that under the Articles of Confederation, Canada was entitled to become a state and join the US. Any other former British colony would need the approval of at least nine states to become a state itself. (See Article XI)
kJ6YE Til when Cleopatra and Julius Caesar met and subsequently became lovers, she was 21 and he was 52