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TIL when Richard Feynman was in the State Curriculum Commission of California, he found out that some members of the committee which was responsible for choosing which books are used in public education had given a rating to not only unfinished, but completely blank textbooks [Page 173]

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aw6O0 TIL Harry Glicken's was devastated when his mentor David Johnson died during the eruption of Mt St Helens in 1980. Glicken met the same fate 11 year's later during the eruption of Mt Unzen in Japan. Glicken and Johnson are the only American volcanologists to have died in volcanic eruptions.
WkmgN TIL the skeletons of medieval English archers were deformed from years of archery. The high poundage of war bows, coupled with years of training in their use from a young age, led to skeletons having over-developed shoulder and arm bones to compensate for the growth of muscle around those areas.
VMBkZ TIL that "Ghostbusters" actor Dan Aykroyd is one of the founders of a popular brand of spirit named "Crystal Head Vodka"
XgMQ TIL a German Mathematician predicted a flood would engulf the world on Feb. 20th, 1524. A nobleman had him build a three story ark to survive this “apocalypse”. People had gathered to see the ark, when a light rain started hundreds were stampeded to death in the ensuing panic.
gMonX TIL there is a theory that the chronic vocal injuries suffered by today's vocalists are directly caused by the "sing from your diaphragm" methods introduced in the 1800s