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TIL that the speed of light was first estimated in the 17th century by Danish astronomer Ole Rømer, not by using any advanced technology, but by observing the motion of Jupiter's moon Io.

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a8JXo TIL Society is designed to keep money away from you
nerXd TIL The Triangle is theoretically an instrument of indefinite pitch, for its fundamental pitch is obscured by its nonharmonic overtones. Triangle parts in classical music can be very demanding and "the triangle is by no means a simple instrument to play"
OAxY TIL: There is a company that gives employees $7,500 extra every year to take a paid vacation, during which they are not allowed to log in, check email, or do anything else “work-related” during that vacation.
gleA TIL that according to the FBI Director, the FBI is having a hard time filling positions to help tackle cyber crimes because a lot of the nation’s top computer programmers and hacking gurus are also fond of marijuana.
698XY TIL there's a man-made borehole that drains 100 million gallons of polluted coal mine runoff every day into the Lackawanna River and Chesapeake Bay.