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TIL Andrew Jackson had a parrot who loved to curse

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via reddit.com

R7M5a TIL there's an auditory illusion named the Shepard Tone, where multiple octaves are looped in such a way that it sounds like it's a sound rising in tone for infinity.
nWEMG TIL that ancient people believed that there was a type of Amber (Lyngurium) made of petrified cat urine
PYbmw TIL that Top Gun was produced in collaboration with the Pentagon to rebrand the US military's image post-Vietnam war, and attract new Navy recruits. Top Gun was the first full-blown collaboration between Hollywood and the US military.
V6xk TIL the term “Bus Factor” - The number of people in a company who need to be ‘run over by a bus’ to send the company into such disarray that it would not be able to proceed.
gGQX TIL The Vikings put a lot of effort into grooming (especially hair and beards), wore eyeliner, were considered vain, and were absolute hits with the ladies. Their combs and other accessories were sought after because of their quality.