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TIL of the Miasma Theory; the belief that the nighttime air was poisonous and carried deadly diseases.

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exL4 TIL, Microsoft makes $2 billion a year from Android
gMW18 TIL the chemical Formamide has been proposed as an alternative to water that could support life with alternative biochemistries to that currently found on Earth. It can be formed with hydrogen cyanide and water, has a large dipole moment, and dissolves almost everything that dissolves in water.
BrxWk TIL that Apollo 11 astronauts were quarantined for 21 days after returning from the moon to prepare for "the remote possibility that they are harboring unknown lunar organisms that might endanger life on earth"
VM1D4 TIL in 2013, female stockings covered in fake male hair became a fashion hit in China as a way to deter unwanted male attention.
781jO TIL that clapping at the base of the Pyramid of Kukulkan produces an echo that sounds like the chirping of a Resplendent Quetzal, a bird that was sacred to the Maya culture.