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TIL the word rooster was coined by English colonial protestants in the 1700s as an alternative to the word cock, in order to avoid the vulgar connotations. Until relatively recent times, this was primarily an Americanism, with most of the English speaking world still using cock for a male chicken.

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mx41R TIL that ferrock is a greener and stronger alternative to concrete by using recycled waste and absorbing carbon dioxide in its production. However, it has not taken off yet because it cost more to make and makes use of waste steel dust which could some day have potential economic uses elsewhere.
R5WW9 TIL the official implementation of Daylight Saving Time had nothing to do with farmers. It was about fuel conversation during WW1 and was originally known as "War Time".
XEbpR TIL of Razzle Dazzle. A carnival game that is designed to make the player believe he is ALMOST winning. But mathematically it actually is near impossible to win despite being very very few points from winning.
OGJJ4 TIL Genghis Khan, sent his small armies against larger ones & used the rest of his forces to terrorize the unprotected civilian population centers.He forced captives to kill their own&hid behind them while advancing,confusing enemies.A master of mobility&depth thus avoiding costly set piece battles.
kKl5 TIL the US gov has held a stockpile of 1 billion cubic meters of helium since 1925. This is due to post WW1 fear that we may run out of helium in case of blimp warfare.