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TIL Aristotle observed that fossils of seashells in rocks resembled those found on beaches. He inferred that the fossils in rocks were formed by organisms, and he reasoned that the positions of land and sea had been changing slowly since ancient times. Leonardo da Vinci agreed with this reasoning.

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JYjd1 TIL coffee is roasted until it "cracks." First crack (about 385 °F) = light roast, second crack (about 435 °F) = dark roast. If roasted past the second crack, the beans will fully carbonize and may combust.
rNeLx TIL on 4/20/1989, 37-yr old Patricia Bernadette Meehan of Pittsburgh, PA disappeared after a high speed car accident outside the town of Circle, MT. Unusually, over 5000 alleged sightings of Meehan have since been recorded. The case remains open.
v1PwD TIL: The Soviet Union built the first supersonic airliner (before the Concorde) and it was a disastrous failure
wLNKE TIL about Loving Day, June 12th; the day that Mildred and Richard Loving finally won their case against Virginia in the US Supreme Court in 1967, legalizing interracial marriage in the US.
78Ldr TIL that the Confederacy bordered a Habsburg Mexican empire controlled by France