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TIL Workers who cut up pineapples eventually lose their fingerprints due to the action of the proteolytic enzyme, bromelain, that dissolves them.

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R5mp6 TIL that a man awaiting a heart transplant survived 100 days on an artificial heart, placed in his chest just like a real one. The invention was created by a father-and-son plumbing duo and originally used normal materials from local hardware stores.
PYG7n TIL historians have estimated that from the years 1798 to 1848, the U.S. Navy lost two-thirds as many officers from dueling as from combat.
64xl TIL Koala fingerprints are nearly identical to human fingerprints and could even confuse crime scene experts when left at a crime scene.
PYXLe TIL of autistic savant Mark DeFriest, aka Houdini of FL. Arrested on a minor charge as a teen, he got a life sentence from escapes/attempts & pranks. He made a zip gun from a toothpaste tube, replicated keys from memory. In & out of prison since 1978, 27 yrs in solitary; he's in prison to this day.
e0EOk TIL the original Star Wars won an Academy Award in editing for the fast pace story telling style it pioneered and used throughout the original trilogy