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TIL of Pythagorean Triple Square Day. This occurs once per century on 9/16/25. The square roots of those numbers make up the Pythagorean triple of 3^2+4^2=5^2.

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8avGZ TIL a B-17 bomber named Old 666 survived being attacked by 20 Japanese fighters for 40 minutes. The pilot and a gunner earned the Medal of Honor, the rest of the crew each received the Distinguished Service Cross. To this day, they're the most decorated American aircrew in history.
b9xPa TIL the United Way released 1.5 mil. balloons over Cleveland in '86. They blanketed the town leading to car crashes, an airport shutdown, stampeding horses, and the suspension of a Coast Guard search for 2 missing boaters who eventually washed ashore dead.
VBpQZ TIL that the first commercial mobile phone, the Motorola DynaTAC 8000X, was released in 1983 and had a price tag of $3,995.
VMbV8 TIL The origin of the word “guy” comes from Guy Fawkes of gunpowder plot fame
kra5 TIL that there is a counterfeit egg industry in China, and one person can make approximately 1500 of them per day.