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TIL sore muscles a day after a workout are not caused by lactic acid build up. It's called DOMS, delayed onset muscle soreness, and it's mainly general inflammation and microdamage.

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GmGQ TIL King James VI of Scotland was so notorious for not reading official papers before signing them, his court jester was able to get him to sign his own abdication papers, making his jester King for 15 days.
X0MDk TIL that you instinctively rub a body part after hitting it bc of the gate control theory of pain. Rubbing it creates non-painful input which closes the nerve "gates" to painful input, thereby preventing pain from traveling to the central nervous system.
ep4eD TIL that Korean footballer Ahn Jung-hwan, who scored the winning goal in South Korea's controvential victory over Italy at the 2002 World Cup, had his contract cancelled by the owner of the Italian club where he was playing at the time the day after he scored it
4XaGX TIL in a traffic stop, Arizona officials seized illegal drugs with a street value of over $1M, then got a search warrant for the driver's property which included a former KFC restaurant. In the KFC floor, they found a hole leading to a 590 ft tunnel where drugs were funneled from the Mexican side.
YpgNW TIL Sigmund Freud's development of psychoanalysis, including concepts such as the id, ego, superego, and libido, was all done under the influence of a constant supply of cocaine, which he advocated unreservedly, and even endorsed for cash.