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TIL the body of Xin Zhui, an Chinese noblewoman from the 2nd century BC, was found remarkably well preserved in a certain liquid in her airtight tomb. Her skin, muscles, organs, blood vessels, hair, and even finger prints were preserved, making it one of the best preserved ancient human remains.

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OovNg TIL the integral of the secant formula, important in cartography, has been found accidentally when a mathematician was running through numerical approximations known at the time and recognized they matched ln(|tan(phi/2 + pi/4)|). It took 28 more years for someone find a formal proof
KYNNG TIL about competitive hot air ballooning, where pilots are tested on distance, speed, and navigation with multiple tasks. Competitions occur at national, regional, international, and world levels, with World Championships every two years.
5rAP TIL If space was full of air, the sun would make an endless bell chime sound at 125 decibels(slightly louder than a train horn) once it reached Earth’s surface.
Egdoo TIL that in 1890 an anticlerical journalist (Leo Taxil) pulled off a 12-year prank to humiliate the Vatican involving: inventing a cult of satanic Freemasons, paying his typist to play the part of a Luciferian Templar Mistress, revealing it all to have been a hoax once the Vatican had endorsed it.
EgY0x TIL Yellow tennis balls were invented by David Attenborough. In 1967 when he was controller of BBC2, he had the job of introducing colour TV and suggested switching from white to a fluorescent yellow ball for easier visibility