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TIL of gravitational time dilation, where gravity also can affect a subject's perception of time like near-lightspeed velocities can. The Earth's core is 2.5 years younger than its surface due to this effect.

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4X87g TIL shooting free throws in basketball underhanded, or “granny style,” is statistically more effective, but players don’t do it because it doesn’t look cool.
GY6LG TIL that on August 16, 1858, Queen Victoria sent a message of approximately 100 words to U.S. President James Buchanan. It took nearly seventeen hours to transmit by Morse code through about 2,500 miles of cable at a depth of often more than two miles.
rRPAy TIL that the term "gaslighting" comes from a 1938 British play called "Gas Light", which follows a woman whose husband slowly manipulates her into believing that she is going insane.
Brn5k TIL Neanderthals practiced cannibalism
kPe7 TIL Prominent science fiction author H.G. Wells enjoyed playing with toy soldiers, and was the first to draft rules for wargames involving the toys, hoping that such a hobby would act as a release so people would not engage in real wars.