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TIL That Sunglass Lens Colors Have Different Uses & Aren't Just For Looks

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XgMQ 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.
oRvWR TIL There’s A World Championship For Microsoft Excel Spreadsheets. In 2019, the competition attracted over 850,000 candidates from 119 countries
0dQP5 TIL about Biofouling, the accumulation of organisms (such as barnacles) where they are not wanted (such as on ship hulls) that causes degradation to the primary purpose of the item. Biofouling can require up to 40% more fuel to compensate for increased drag and reduced speeds.
a8Bmb TIL Gustav III of Sweden got a letter saying he was about to be killed at the masked ball he was attending later. He dared the would-be assassins by standing in an open box at the opera house for 10 minutes. Since he didn't get shot there, he deemed it was safe to join the crowd...where he got shot
Ood57 TIL that Prince Phillip, Duke of Edinburg, a relative of the slaughtered Romanov family, gave a blood sample to help genetically ID their remains when they were discovered and exhumed.