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TIL that drinking caffeine-containing beverages doesn't cause fluid loss in excess of the volume ingested.

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rNDWe TIL that the first flashlight in 1899 could only run for 5 minutes before needing to allow its batteries to recover, and could only run for 30 minutes before it needed a battery replacement. Its output was about 1 lumen of brief flashes of light. It was used mostly by policemen and railway workers.
Gxd5 TIL The actor who played Mr. Peterman in Seinfeld is now part-owner of the J Peterman company after he helped finance the real life John Peterman in buying back the brand name.
1a9aV TIL that for Jewish writers in the classical world, Egypt was viewed as a country where lesbians were stereotypically common. While male homosexuality was ascribed to Sodom and Gomorrah, Maimonides described lesbianism as the "acts of Egypt."
KY0aQ TIL: TLC was the first all-female group to sell 10 million copies of an album - CrazySexyCool. But they weren't cool about making $50,000 each for the album while the record company got $75 million. So, they held Arista Records President Clive Davis hostage until the NYPD intervened.
j6JAN TIL: The British Ministry of Pensions distributed Invacars free to disabled people from 1948 until the 1970s. The Invacar was that vehicle.