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TIL that Silbury Hill, a man-made structure almost as old as the Great Pyramid, but built in Britain, covers an enormous area equal to more than four football fields. But historians are still not sure about its purpose.

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via reddit.com

ne9v9 TIL about the U-238 Atomic Energy Lab, marketed to kids as a toy in the 1950's it came with 3 different types of live Uranium Ore and a Geiger Counter. The kit's intention was to allow children to create and watch nuclear and chemical reactions using radioactive material
OogV6 TIL Daniel Radcliffe's parents initially turned him down for the role of Harry Potter in 'The Philosopher's Stone' because the initial plan was to shoot six films in LA. They accepted the role after filming was moved to the UK and the contract reduced to 2 movies.
P86w TIL that The Shawshank Redemption’s director and writer, Frank Darabont, was offered $2.5 million from Rob Reiner to let him write and direct it instead, and cast Tom Cruise as Andy and Harrison Ford as Red. Darabont refused, saying that this was his “chance to do something really great.”
p8VQQ TIL that it's possible to ignite methane in the colon during a colonoscopy... Intracolonic explosion
LQLE9 TIL that Tennessee, Utah, Florida, Indiana, and South Carolina license plates reverse order of numbers vs letters based on if the plate has In God We Trust on it.