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TIL in 499 century BC, king Histaiaeus (ancient Greece) sent secret military messages tattooed on bald heads of messengers. After the hair regrew, they sent the messengers. In the destination they were shaved again to reveal the message.

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neYOP TIL Leif Erikson may not have even been the first Norsemen to discover the Americas. In 986, Bjarni Herjolfsson sighted the mainland while trying to sail to Greenland. He decided to not make landfall, and later sagas would not include him, giving most, if not all, of the credit to Leif.
OjAR TIL Sunscreen is contributing to decline of coral reefs. The damaging effects were seen in coral in concentrations of oxybenzone as low as 62 parts per trillion, which is equivalent to a drop of water in six and a half Olympic-sized swimming pools, according to the researchers.
glN8 TIL Christianity existed in China as early as 635 AD
WZAA TIL That CAPTCHA is short for Completely Automated Public Turing test to tell Computers and Humans Apart
WWeA TIL When Marquis de Lafayette died, President Jackson ordered that he receive the same memorial honors bestowed on Washington’s death. Both Houses of Congress were draped in black bunting for 30 days.