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TIL that the de Bothezat helicopter was a quadcopter that first flew in 1922 and Thomas Edison called it the first successful helicopter.

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rN1V0 TIL That Vietnam has the most favorable view of the United States in the world
QNgVe TIL that actor Sterling Hayden (Johnny Guitar, The Killing) was an OSS agent during World War II under the alias 'John Hamilton'. His work with Yugoslav partisans influenced him to briefly join the Communist Party, but he left quickly and later named names before the HUAC.
KOZDR TIL William Still, the father of the Underground Railroad, interviewed and kept records of every escaped slave he came across. Once, while interviewing a man, he discovered that the man was actually his long-lost brother.
WGyd TIL there is a mathematical formula that suggests that the emergence of life is inevitable
R7yD7 TIL that a person's ability for spacial and verbal memory can be affected by which nostril is used: left, right, or alternate nostril breathing