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TIL that NBA player Bill Walton was an uncredited background extra in the 1984 film Ghostbusters

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DN4Y TIL ‘Water Residence Time’ is how much time it would take to fill up a lake again if all of its water were suddenly removed. The lake with the longest water residence time is Lake Tanganyika in Africa at 5,500 years.
RjG1 TIL that it is incredibly cruel to keep Betta fish in small containers. They naturally should live up to 5 years and the smallest recommended container is 5 gallons. The small cups they are sold and live in are what cause drastically shortened lifespans.
D19jP TIL that mathematicians have proved a majority-rule democracy can be forced to vote in favor of any set of policies by constructing a series of intermediate policy sets, each of which a majority of voters will prefer to the preceding policy set.
kOVZ4 TIL The dictator of Burma (Myanmar) was obsessed with numerology. He removed 50 Kyat and 100 Kyat banknotes from circulation. Replaced them with 45 Kyat and 90 Kyat banknotes. The economic instability which followed led to a coup d'êtát in 1988.
awbro TIL: That leeches are still used in modern medicine.