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TIL of Abraham Wald, who in WW2 proposed that the US Military focus on reinforcing sections of the returning planes showing the least concentration of bullet holes. Initially, the Military planned to reinforce sections containing the most bullet holes, disregarding the phenomenon of survival bias

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mo0E TIL that some species of bamboo can grow about 3 ft (91 cm) in a single day.
8kmP TIL that (in the US) if someone ships you something by mistake, you can consider it a gift and keep it. Based on federal law you are under no obligation to return it, nor can they attempt to bill you for it.
DQQED TIL Credit Scores in the US didnt exist until 1989
e04aL TIL that in April of 2018, scientists at the Gladstone Institutes in California completely erased Alzheimer’s disease damage in human cells by changing the structure of one protein.
lGBK TIL At the time of death, Cornelius Vanderbilt was the world richest man and left an estate larger than the US treasury. When 120 of his descendents gathered in 1973, there was not a millionaire among them