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TIL after the Apollo 11 crew returned to Earth, they were quarantined for 3 weeks to prevent any possible microbes from the Moon infecting Earth. However, Buzz Aldrin saw ants crawling in and out of cracks in the concrete, meaning even smaller microbes could have gotten in and out of quarantine.

DQDvv TIL about the Graham's number. It is so large that the observable universe is far too small to contain an ordinary digital representation of Graham's number, assuming that each digit occupies one Planck volume, the smallest measurable space. The last 13 digits are ...7262464195387
0we9j TIL that the defunct Pan Am Airlines used to weigh their stewardesses before each flight, to ensure they didn't weigh over 140 pounds. On top of that, they had to be between 5'2 and 5'9, agree to retire by 32, not be married, no older than 27 to apply, not have children, and not be pregnant.
N79mJ TIL "Bridget Loves Bernie" was the #5 TV show of the 1972-73 season but was canceled after one year due to the controversy of its story of a wealthy Catholic girl marrying a Jewish cab driver. It was the highest-rated show ever to be canceled after one year.
v1lPB TIL that Susan Bennet, who was the original voice of Siri, didn’t find out her voice had been chosen until a coworker emailed her and asked if it was her voice
8eAAb TIL the Steamboat Bertrand, which sank in 1865, while carrying cargo up the Missouri River to Montana Territory. It was rediscovered in 1968 with half of its cargo being recovered. The cargo makes up the largest intact collection of Civil War-era artifacts in the United States.