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TIL of Mo-99—a radioactive isotope of Molybdenum used in hospitals to produce the radioactive tracer Technetium-99m (for medical imaging). Mo-99's half-life is just 66 hours, and is made commercially in only 4 nuclear reactors around the world, most of which are reaching the end of their life.

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8j5K TIL most states allow security cameras in dressing rooms, some behind two way mirrors.
KGy6 TIL Helen Keller was not born blind and deaf, but became so as a result of “brain fever” and was friends with many celebrities during her lifetime ranging from Mark Twain, Charlie Chaplin to John F. Kennedy
yQ47p TIL the first song Joshua Radin ever wrote and recorded (on his roommate’s computer) was ‘Winter’, which was featured at the end of arguably the best Scrubs episode, ‘My Screw Up’. He was friends with Zach Braff because they went to Northwestern together. It launched his music career.
AMwl TIL that after comedian Bill Hicks’ set was edited out of The Late Show With David Letterman in ‘93, he wrote a 39-page letter detailing exactly what happened behind the scenes.
mxbrP TIL The M1 Abrams, currently the main battle tank of the U.S. Army, requires 10 US gallons (38 L) of fuel just to start the gas turbine