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TIL the human body contains detectable level of precious metals like gold, silver and, platinum

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W79D8 TIL that Limestone powder is poisonous.
awa89 TIL in 1949, the Admiral television company sponsored the Admiral Broadway Revue TV show on NBC and DuMont. Six months later, they canceled the show not because it was unsuccessful, but because it was so popular they couldn't keep up with the manufacturing demand for TV sets.
LbR0 TIL that a solid 8 hour sleep is actually unnatural to us as a species. A 4 hour sleep, waking for 1-2 hours, followed by another 4 hour sleep is how we slept for the majority of evolution. The change to a solid 8 hour sleep was originally attributed to improvements in lighting and other things.
NMx8 TIL That during the filming of Breaking Bad the crew was shooting a scene featuring Wendy the prostitute when they were interrupted by a person who mistook the actress for a real hooker and tried to pick her up.
oBvbW TIL as a child Jimi Hendrix, being left-handed, would secretly restring his guitars to fit his left hand, but when his superstitious father was around (who believed it was bad luck to play with your left hand), he taught himself to play the normal guitar upside down.