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TIL that the katzenklavier ("cat piano") is a hypothetical musical instrument made out of cats. Designed by 17th-century scholar, Athanasius Kircher, it consists of a row of caged cats with different voice pitches. It is to be "played" by driving a nail into the cat's tail to make it yowl

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ZePB TIL Every autumn Black-capped Chickadees allow brain neurons containing old information to die, replacing them with new neurons so they can adapt to changes in their social flocks and environment even with their tiny brains.
b9X8j TIL about Peter's Principle OR why everyone sucks at their job. People who excel at work are promoted, to a point where they are incompetent. With every promotion, you are closer to newer and more complex job needs. This incrementally makes you worse at your job to the point of incompetency.
OVn6 TIL there is a curry so hot that it is higher on the Scoville Scale for hotness than tear gas. It’s also so hot that only ONE MAN on earth has been able to finish a full serving and that guy wandered around town hallucinating for ten minutes halfway through his dish
eXZ5 TIL that in 1982 the Mayor of Key West, Florida announced the town’s secession from the union, immediately declared war against the US, quickly surrendered after one minute, and applied for one billion dollars in foreign aid.
E1ZWx TIL that for his voice performance of Sauron in the Hobbit films Benedict Cumberbatch spoke his black speech lines backwards, which were then played forwards, to give them a more 'disembodied' feel.