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TIL cheetahs cannot roar but instead meow like house cats

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rNmGx TIL Geologists were able to determine the origin of the 9,300+ Japanese Incendiary bomb balloons launched against the US during WWII by analyzing the sand used in the ballast of the balloons
OG7k4 TIL of the Koryo burger, a well known item on the inflight catering of Air Koryo, a north Korean airline. The "mystery meat" burger is served with cheese, cabbage and a brown sauce, cold to passengers. Vegetarians are offered the burger bun with extra tomato slices.
LQEBr TIL that in 1942, Manhattan Project needed 5000 tons of copper, which was in short supply; to avoid delays, it borrowed 430 million troy ounces of silver from US Treasury to be used in magnets. The silver was fully returned by 1970 as the equipment was decommisioned.
BrWWk TIL electric cars have been around since the 1800s and used to be common in the US and Europe, with (for example) a 1901 Baker Electric being capable of going over 200 miles on one charge.
woO98 TIL that in the background of the movie Stuart Little is a long lost painting. an art historian spotted it and it turned out to be the original.