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TIL that ‘one banana’ is a legitimate measurement unit for radiation exposure

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VB55B TIL that a hefty keychain, with lots of keys, is definitely BAD for your car's starter switch.
XErRj TIL that when Ethiopian Airlines Flight 702 was hijacked and flown to Switzerland, the Swiss Air Force did not respond because the "incident occurred outside normal office hours."
b61Z9 TIL of the Deceased Wife's Sister's Marriage Act 1907, an Act of the Parliament of the United Kingdom which permitted widowed men to marry their dead wife's sister, which had previously not been legal. Under the act, a man marrying his divorced but living ex-wife's sister was still forbidden.
kOE54 TIL scientists observed the transition of unicellular yeast to multicellularity by repeatedly separating cells by gravity and collecting the cells settled at the bottom of the tubes. The cells eventually formed clusters and subsequent genetic mutations favored the clusters over the individual cells.
R7989 TIL about Monte Testaccio, the 'Mountain of Pots' in Rome, a hill made entirely from around 53 million discarded ancient Roman containers used to carry olive oil. It is one of the largest ancient 'spoil mounds' in the world, and is now key in understanding Roman trade routes in Spain and Libya.