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TIL that LBJ had a buzzer installed in the Oval Office to warn him when him when his wife was coming while having sex with other women.

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9wPVQ TIL Orson Welles once accidentally pelted his audience with arrows. Welles was doing Henry the Fifth in Boston and had set the archers to shoot offstage, but it was a rotating stage. Welles had noticed the problem but expected the Harvard students to not foolishly shoot into the crowd, he was wrong.
9w7mX TIL that Wally "Famous" Amos first worked as a talent agent and signed Simon & Garfunkel. He would attract clients by sending them chocolate chip cookies along with an invitation to visit him.
MelYW TIL that in the early 1900s, it was believed that human cells in culture would proliferate continuously, but Leonard Hayflick proved that cells “remember” their replication level and have a limit to the number of times they can divide, also that cancer cells do not, so only they are immortal.
4adb TIL Until the 1960′s, the only reliable pregnancy test was to inject a woman’s urine into a female African clawed frog. If the woman was pregnant, the frog would ovulate within 12 hours.
GB9j TIL that Rihanna was sued for her use of the sample “Mama-say, mama-sa, ma-ma-ko-ssa” in her song “Please Don’t Stop the Music” because she only got permission for using it via Michael Jackson from his use of the sample in “Wanna Be Startin’ Somethin” and not from the original artist Manu Dibango.