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TIL a German Mathematician predicted a flood would engulf the world on Feb. 20th, 1524. A nobleman had him build a three story ark to survive this “apocalypse”. People had gathered to see the ark, when a light rain started hundreds were stampeded to death in the ensuing panic.

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6EP57 TIL of convicted train robber Frank Grigware, who escaped from federal prison in 1910. A short 6 years later, he became mayor of the small town of Spirit River, Alberta. The FBI discovered him in 1933, but his extradition request was dropped due to 'serious doubts' about his original conviction.
xLjD TIL Albert Stevens was injected with plutonium without his knowledge or explicit consent in 1945. He survived over 20 years, accumulating a total radiation dose of 64 Sv - the highest known in any human being.
BgvNe TIL, White Horse Temple, the first Buddhist temple in China, was desecrated heavily during the Cultural Revolution. At the same time, when the King of Cambodia requested to visit the temple, the Chinese authorities quickly restored it including placing artefacts from other museums in the temple.
LkMkQ TIL that Snapchat trolled Facebook on April Fool's day with a 'Facebook' filter, designed to recreate Russian bots on Facebook deployed during 2016 US Presidential election. The filter placed a Facebook UI around the photo with Cyrillic script-like text and showed likes from “your mum” and “a bot”.
4kXxg TIL that Spain has the longest high speed rail network in Europe and is second in the world behind China.