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TIL in 1880 Alexander Graham Bell and his assistant Charles Sumner Tainter created a very early precursor to fiber-optic communications, the Photophone, a device allowed for the transmission of sound on a beam of light.

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WkmQ9 TIL that slaveholders in the US knew that enslaved people were escaping to Mexico, the U.S. tried to get Mexico to sign a fugitive slave treaty, but Mexico refused to sign such a treaty, insisting that all enslaved people were free once they set foot on Mexican soil.
VQo0 TIL that gyro, döner, and shawarma are just the Greek, Turkish, and Arabic names for the same dish. All three words mean “to turn,” referring to the turning spit of meat used in the cooking process.
NXvpN TIL that fortune telling is a class b misdemeanor in NY state (but is allowed for entertainment purposes only, rather than claiming it is the truth)
neJy7 TIL When Dutch biking company VanMoof began shipping their bikes to the USA a lot of them were arriving to their new customers damaged, so they decide to put an image of an expensive, flat-screen television on the cardboard boxes.
4vWb TIL 50% of expert chess tournament games end in a draw