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TIL in 1941, movie starlet Hedy Lamarr invented and patented an early technique for spread spectrum communications and frequency hopping, necessary for wireless communication. This is the basis of WiFi, CDMA, Bluetooth and other modern communication technologies.

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E1brX TIL that photographer Eddie Adams regretted that Vietnamese General Nguyen Ngoc Loan was perceived negatively after his Pulitzer-winning photograph of Loan executing a war criminal and described Loan as "a goddamned hero."
6Ean7 TIL the premise for The Smashing Pumpkins music video "Today" was inspired by a memory from Billy Corgan when the local ice cream truck driver quit his job, and he ended up giving away all of the ice cream in the truck to all the neighborhood kids.
9koD TIL that one acre of hemp (grown in a single season) yields as much paper as up to 4 acres of trees.
LQdom TIL "Nuclear Gandhi", a glitch in the video game Civilization which makes the typically peaceful leader Gandhi aggressively use nuclear weapons, is a myth. There's no evidence such a glitch exists in the game, and several of the game's creators have stated that it's impossible for it to happen.
oRpWr TIL: Einar Thambarskelfir was known for his skills as an archer and his weight. His translates to "wobbly belly" or "belly of the bow". He became de facto leader of Norway until he was assassinated by Harald Sigurdsson under the false pretense of a meeting. His wife then raised an army in revenge.