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TIL the first chiropractor was a Canadian who claimed he received a message from a ghost

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via reddit.com

7AZO TIL some orthodox Jews in the New York area use caffeine suppositories for fasting, because it’s not “eating”
GYkE7 TIL doctors from UCLA found unique blood cells that can help fight infections in a man from Seattle's spleen, so they stole the cells from his body and developed it into medicine without paying him, getting his consent, or even letting him know they were doing it.
PYbOg TIL that Ivan the Terrible of Russia had a bodyguard corps that wore black clothing and rode black horses. They also had a severed dogs head attached to their saddles, using them to “sniff out” treason. Due to the lack of taxidermy, a constant supply of fresh heads was needed.
QLja TIL When they return to Earth, astronauts have to fill out government travel vouchers as if they were on regular business trip. Link to Apollo 11 voucher in comments.
GYYNg TIL that "shooting fish in a barrel" is considered easy because the bullet impact causes the water pressure in the barrel to change suddenly, killing every fish instantly.