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TIL Nikola Tesla's childhood cat, Macak, played a role in his famous contribution to science. Reflecting upon the experience of static electricity after he stroked his cat, he wrote, "Is Nature a gigantic cat? If so, who strokes its back? Day after day I have asked myself, what is electricity?"

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5YkK9 TIL a feral cat with ear-tip (part of their ear is missing) means they've been caught, treated, neutered, and released
RBR7 TIL that in parts of Philadelphia you must be fingerprinted to trade in games at GameStop.
R6g4 TIL of the Vela Incident, A nuclear explosion in the Indian ocean of unknown origin. The most widespread theory is that it was a joint South African-Israeli nuclear test.
WveB TIL that in 1990 there was a revival series of The Brady Bunch called The Bradys, which featured most of the original cast and had more dramatic storylines (e.g., Bobby becomes a parapalegic and Marcia is an alcoholic). It lasted for 6 episodes.
8X0a TIL that Elaine’s father on Seinfeld, played by Lawrence Tierney, was supposed to be a recurring character, but he horrified the cast and made threatening gestures toward Seinfeld with a knife.