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TIL Olympic swimming pools must be sprayed with water during diving. It’s a safety feature called mechanical surface agitation and it allows diver to determine when they should enter their rotation.

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nWl5o TIL the astronauts from the 1st moon landing were quarantined with mice for two weeks. If the mice survived, the astronauts would be let out
R7jdw TIL coins like pennies actually have no odor. Metals such as iron & copper catalyze a chemical reaction in skin oils which produces the source of the "metal smell", a compound called 1-octen-3-one, and every person's smell is slightly different.
yQNrM TIL That the loudest sound ever recorded was the Krakatoa volcano eruption in 1883. It was so loud that it ruptured the eardrums of people 40 miles away, traveled around the world four times, and was clearly heard from 3,000 miles away.
p8LxG TIL that, 49 million years ago, moss rapidly transformed the earth from 'greenhouse earth' to 'icehouse earth' that we live in today - changing c02 from 3,000 ppm to 500 ppm.
P1MAg TIL ABBA member Anni-Frid was born as a result of the Lebensborn experiment, the scheme run by Heinrich Himmler, leader of the SS, to create an Aryan master race.