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TIL of the Frog Test, a pregnancy test where a woman’s urine was injected into a frog, and if it started ovulating, the woman was pregnant. It was used in the 1940s-60s and was surprisingly accurate.

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9WeM TIL that the Roman Emperor Nero bought a young boy, married him, castrated him and dressed him up as a girl at public events.
8WPK TIL of SawStop, a device that will stop a table saw in 1/1000th of a second if it detects a hand
b6Wva TIL Cristiano Ronaldo (racing heart) and Lionel Messi (growth hormone deficiency) both had health issues that could have prevented them from playing football.
7vWb TIL in 2002 Sony released a “copy-proof” CD to combat music piracy. Hackers immediately circumvented this design by scribbling on the rim of the CDs with a Sharpie.
v1Noj TIL The Steve Miller Band hit "Jet Airliner" was not a Steve Miller Band original. The song was first recorded by Paul Pena in 1973. Due to record label disputes, Pena's version of this song was not available to the public until the year 2000