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TIL that the the concept of "zero" was invented by a 6th century Indian mathematician named Aryabhata. He also theorized on the relativity of motion, worked on the approximation of π, and correctly advocated an astronomical model in which the Earth turns on its own axis

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JPVj TIL that Mary Babnik Brown was chosen to donate her hair (which had never been treated with heat or chemicals) to become the crosshairs on Norden bombsights during WWII.
x6Epb TIL that no US President has ever used the Emergency Alert System despite events such as the 9/11 attacks, the Oklahoma City bombing, and the Cuban missile crisis. It is believed that the audio-only EAS messages would actually hinder the ability of the media to present live news coverage.
6NpQ TIL that in 1947, a group of kids in Canada sparked a series of protests against candy manufacturers who raised the price of chocolate bars from 5 cents to 8 cents.
dDWKK TIL that the word "hello" is younger than the United States. It was first attested to in writing in 1826.
RQ6l TIL of ‘Red Shirt Guy’ who stumped a panel of World Of Warcraft devs during a Q&A at BlizzCon, 2010, after asking about an inconsistency in the lore. Later, an NPC was introduced into the game who wore a bright red shirt and was named Wildhammer Fact Checker.