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TIL that the “sleep” in your eyes when you wake up helps seal your eyes in an air tight fashion when they are closed; prevents tears from spilling onto your cheeks; and helps keep tears that coat your eyes from evaporating.

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0dbap TIL when Japanese-American Norm Mineta was interned as a child, US authorities confiscated his baseball bat. Later elected to Congress, someone gifted him a $1500 Hank Aaron bat-- which he had to return, since it violated House rules on gifts. Said Mineta: "The damn government's taken my bat again."
YKWG TIL There’s a warm underwater current that starts in Florida and travels to Britain. If this stopped the UK would have a climate similar to northern Canada.
NXwP6 TIL that Thomas Edison and his partner, Edward Johnson, invented the first electric Christmas lights. For Christmas in 1880, Edison dressed his laboratory in lights; and, in 1882, Johnson put electric lights on a Christmas tree. However, lights were expensive, costing about $2,000 per tree in 1901.
e000b TIL that in July 2014 a German tourist got into a fight while in Bulgaria. Following advise not to fly he said goodbye to his friends and booked a hotel. A day later he started acting strangely and was last seen running out of Varna airport and climbing a fence, his whereabouts are still unknown.
kJnX7 TIL because of Flight 1549 "Miracle on the Hudson" As of 2017, 70,000 birds had been intentionally killed in New York City as a result of the ditching.