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TIL that the US government used an Atomic Bomb to launch a manhole cover 125,000 mph (201,160 kph), that is the fastest that a man-made object has traveled. It is also said that it beat the Sputnik to space, although that was never confirmed.

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5Vx8Q TIL the term leap year probably comes from the fact that a fixed date in the Gregorian calendar normally advances one day of the week from one year to the next, but the day of the week in the 12 months following the leap day will advance two days due to the extra day, thus leaping over one day.
Vnvp TIL King of the Hill has a drawn list of animation help for their oversees animators to prevent breaks in continuity and Asian influenced animation issues.
nexmB TIL American Airlines saved $40k a year by removing one olive from each food tray in first class
BgZBK TIL The Great Wall of China is often regarded as one of the most impressive architectural feats in human history
M7R9a TIL that the nation of Tuvalu's Top Level Domain is .tv, and is it's #1 export.