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TIL about the Coudersport Ice Mine in Pennsylvania. Huge ice formations up to 3' thick and 25' long appear in the cave during the spring and summer. The formations disappear in the winter.

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OG0ra TIL of the "Devil's Cigarette Lighter," a natural gas fire that burned for nearly 6 months in the Algerian desert. It rose between 450 ft (140m) and 800 ft (240m) high and burned over 550 million cubic feet of gas every day. It was witnessed by John Glenn while in orbital spaceflight.
R76PQ TIL that Usain Bolt, the fastest man in the world and six-time Olympic gold medalist, has never run a mile.
Q68E TIL that in an 8-hour day, the average worker is only productive for 2 hours and 53 minutes.
gNjX TIL that H&R Block owns the trademark for the GIF file format.
bY4 TIL that America’s first recorded student protest, the Great Butter Rebellion, was sparked by the cry ‘Behold, our butter stinketh! - give us therefore, butter that stinketh not.’