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TIL when a person is frequently exposed to cold water and wind, they develop bony growths inside their ear canals. If left undealt with, the growth will completely block the ear canal and cause significant or total hearing loss.

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LaZd TIL until 40 years ago scientists believed all life and food chains ultimately depended on the sun for energy. The discovery of deep sea vents with whole ecosystems driven solely by chemical energy changed this view. Now it’s thought that life may have actually originated from such systems.
689Y TIL there is an anti-date rape cup and straw. They detect date rape drugs when placed in a beverage to alert the victim.
m10By TIL of sawstop technology: It's patented by a single manufracturer who doesn't license its use to anyone else in the industry. For years, it was the only patent able to prevent table saw accidents and tried to use their patent rights to prevent making any similar safety system, with partial success
BVpK TIL that while bored during his work with the Manhattan Project Richard Feynman would amuse himself by picking the locks of his colleges confidential file cabinets and placing prank notes, his colleges believed a spy had infiltrated the project.
XEXR8 TIL Mary Queen of Scots suspected of murdering her husband fled to England for help. Cousin Queen Elizabeth I, threatened by Mary’s claim to her throne, imprisoned her 19 yrs then beheaded her. Elizabeth had no children so Mary’s son ironically became first king over England, Scotland & Ireland