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TIL that the Channel Tunnel was originally proposed in 1802 and construction was attempted in 1880. Two tunnels were dug but the project was scrapped due to fears of invasion. The tunnels and the boring machine still exist under the Channel.

4Djg TIL Fritz Haarman ran a butcher shop in post World War I Germany where he sold inexpensive meat to impoverished customers. Some were suspicious of his low prices and discovered he had murdered up to 50 boys and men and ground their bodies into sausage.
7rZ5M TIL the first movie in color was made already in 1902, the earliest color moving images ever made pre-dating 'Kinemacolor' by eight years. A British cinematographer, Edward Turner's footage of his children was found in a discovery in The National Media Museum in Bradford.
M7ONb TIL that the leopard attack scene in 2001: A Space Odyssey involved a real leopard pouncing on a real person. Kubrick, despite being known for recording several takes of every shot, only recorded a couple takes to protect the actor and accepted that he wouldn't like the end result.
QN9o6 TIL that much like in the movie Dune, you can make earthworms surface by vibrating earth at a specific frequency. This technique is called 'worm grunting' and it consists in driving a stake in the ground and vibrating it using a metal rod. This technique is used to catch worms for fishing bait.
yOYa TIL In 1960, runner Harry Jerome broke the world record for 100 metre sprint, but it wasn’t counted because Canadian officials didn’t believe a Canadian could run that fast.