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TIL of a study to determine contamination levels for computer keyboards in the average office setting. One keyboard had to be removed after testing because it was found to be five times dirtier than a toilet seat, home to 150 times the acceptable limit of bacteria, and was a health risk to its user.

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JY914 TIL about the Groom of the Stool: the most intimate of an English monarch's courtiers, responsible for assisting the king in excretion and ablution. Under Henry VII, the Groom of the Stool became a powerful official involved in setting national fiscal policy.
yQ78a TIL, authors will write themselves into their own stories for various purposes. Stephen King wrote himself into the Dark Tower series after a near-fatal accident. (Stephen King in the book also suffers the same accident)
Mjk7 TIL that Jacksonville, Fla., was the winter filming capital of the early US movie industry but conservative residents objected, a mayor was elected on anti-movie platform, and so the industry moved on to Southern California
epZ9b TIL That "RadiThor, an energy drink originally contained radium. A 1oz bottle would sell for about $1 (US) in the 1920's. It was also claimed that it would cure all sorts of ailments.
GYN4g TIL:That Cleopatra, while born Egyptian, traced her origins to Greece, may have been more renowned for her intellect than her appearance. She spoke as many as a dozen languages, was well educated, and was later described as a ruler “who elevated the ranks of scholars and enjoyed their company.”