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TIL in 1983, a German newspaper paid 3.7 million dollars for copies of Hitler's diaries. They were authenticated by an expert. They were later found to be poor quality forgeries.

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R7Em6 TIL that in World War 1, Nobel prize winning physicist Marie Curie developed mobile X-Ray stations to travel to the frontlines and assist army surgeons and preventing amputations when limbs were still intact. It's estimated that over a million wounded soldiers were x-rayed with her units.
1aO6r TIL researchers found naturally occurring lithium in the water supply lowered suicide rates. They were able to measure lithium levels in 27 Texas counties and show those with more lithium in their water had fewer suicides. Similar studies in Greece, Austria, & Japan corroborated the results.
j64Kn TIL that an asteroid traveling at 20 kilometres (12.4 mi) per second collided near South Africa 3.26 billion years ago creating a megatsunami that extended to a depth of thousands of meters beneath the surface of the ocean and rose to the height of a skyscraper when it reached the shorelines.
6985m TIL that if all the world’s bacteria were laid end-to-end, they would reach 10 billion light-years in length. However, at 75 times thinner than a human hair, it would still be invisible to the naked eye. The length could wrap the Milky Way more than 20,000 times, creating a 2cm wide visible ribbon.
M6dW TIL the words “For Our Princess” are engraved inside every Microsoft Zune HD as a tribute to a team member who passed away during its development.