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And does an emerald hue always mean it's time to run inside?

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LQy89 TIL that silver fulminate is so unstable that the weight of a falling feather will cause a few milligrams to explode. It also can't be collected in larger quantities because it self-detonates under its own weight.
PYWDV [TIL] William Chester Minor cut off his penis and contributed a lot to the Oxford English Dictionary.
Melk7 Today I learned that female navels were banned from American television from 1951 to 1983.
OGA7Y TIL former UK prime ministers can claim up to £115,000 a year for life.
R5961 TIL that when composer Joseph Haydn died his head was stolen for study by people practicing phrenology-the pseudoscientific study of how the shape of ones skull reflects their intellect. His skull was eventual returned and interred with the rest of his body in 1954, 145 years later.