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TIL that the on and off buttons were from binary numbering system where “0” is off and “1” is on. So to create the universal power symbol, “0” and “1” were combined to make the power button symbol.

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QNQxX TIL Pandas fake pregnancy inside zoos deliberately to get better treatment and snacks
kOMm7 TIL, before recordings were available, music stores employed song pluggers. These people were pianists or singers that would play any song on request so patrons could have a preview before buying the sheet music.
e0M45 TIL about the Gombe Chimpanzee War, a violent conflict between two communities of chimpanzees that lasted 4 years
nepp7 TIL of Joy Milne, a “super-smeller” who found she could smell a unique odor on people with Parkinson's disease years before the onset of symptoms. Scientists then isolated biomarkers in sebum (oily substance from face/back) of Parkinson’s patients, paving the way to earlier detection/treatment.
nd0o TIL Stan Lee once commented that he liked to work “science” into all of his stories, and that Hulk’s pants were the only time he never had a clue how the exact science behind it worked.