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TIL during WW2, a 360 ft long prehistoric chalk horse figure on a hill in Britain, was covered over with turf and hedge trimmings so that German pilots could not use it for navigation during bombing raids.

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kOm45 TIL The 49th Parallel, a 5,525-mile long border between Canada and the United States of America is the longest undefended international boundary in the world. However, it is not without disagreements. The Northwest Passage, claimed by Canada, are viewed as international shipping waters by the U.S.
v1op8 TIL the words you use when questioning witnesses greatly affects their answer. They showed study participants video of a car crash and asked them to estimate the speed. Their estimates got progressively larger when using the verbs contacted, hit, bumped, collided, smashed in the question.
kJnWe TIL that when Billy the Kid learned Joe Grant was coming to kill him, he sabotaged Grant's revolver. Grant attempted to shoot Billy in the face and when the gun did not go off, Billy killed Grant
4XaKX TIL inmates at Riker's Island are paid $1 an hour to bury unclaimed bodies on Hart Island. I also learned that Hart Island is a place in NYC that used to house an insane asylum for women, city jails, and a "reformatory for vicious boys."
gx4W TIL in 2007, a US Marine in Iraq befriended a stray desert dog called Nubs. After someone stabbed the dog with a screwdriver, the marine nursed him back to health, developing such a bond that when the unit left, Nubs picked up the scent and walked 70 miles through Iraqi desert warzone to be with him