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TIL in the 1980s, the BBC televised a live demonstration of email. Prior to transmission, a studio guest overheard a crew member saying the email account password and phoned a friendly hacker. Once on air, the presenter logged in – and was met with a poem about hacking and insecure passwords.

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1aWNX TIL that when you get a sunburn, it's not your skin cells being damaged by the sun's UV rays and dying, it's your skin cells' DNA being damaged by the sun's UV rays making the cells kill themselves to prevent turning into cancer
R71ra TIL the term "butterfly effect" in chaos theory might have its origins in a 1952 Ray Bradbury short story. In it, a time-traveler travels back 66 million years where he accidentally crushes a butterfly, resulting in an altered timeline observed upon his return.
GAv4 TIL That you can actually improve the grades you make on a test by studying the material in the place you’re about to take the test.
6mal TIL That more often than not in the history of the United States, we have been in a Panic, a Recession, or a Depression…..
AlMB TIL that Newgrange is a 5,000-year-old tomb and time-telling device. At dawn from Dec. 19th-23rd, a narrow beam of light penetrates the passage chamber and the entire room becomes dramatically illuminated for just 17 minutes. There is a lottery to determine the few witnesses of the event each year.