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TIL measles was first described by a Persian physician in the tenth century.

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yV8nl TIL that aqueducts are water channels that use gravity to move water from a source to a destination. An ancient Roman aqueduct used only a 51 foot height difference to push water down a 31-mile-long path, resulting in as little as a 1-inch drop to push water 1,500 feet.
MeGEV TIL Louis Braille lost his sight at 5 years old after an accident trying to make holes in a piece of leather with an awl. 10 years later, he completed his system of reading and writing for use by the blind or visually impaired. Braille created his own raised-dot system by using an awl.
E1N7W TIL when Mr. Potato Head was first introduced, parents were expected to supply their own potato. Federal regulations made the pieces less sharp, so Hasbro was forced to include a plastic potato with pre-made holes.
rRKMy TIL that the tanuki, also known as "japanese raccoon dog", is neither a raccoon or a dog.
BraXL TIL a 2011 study showed that a group of 4 year olds had a temporary lapse in cognitive function after watching 9 minutes of SpongeBob