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TIL crows can remember faces and hold grudges for at least fifteen years

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KO7k4 TIL "yelling FIRE in a crowded theater" was coined in 1919 to imprison anti-war activists who published leaflets opposing the Draft, which constituted a "clear and present danger" under the Espionage Act.
BgVxK TIL that 1,235 Canadian geese were rounded up and gassed to death after the famous incident of pilot Chesley Sullenberger ditching a passenger plane on the Hudson River with no fatalities, following a bird strike.
x6Jj1 TIL the oil behind poison ivy, urushiol, can also be cured and turned into a fine lacquer used in Asian decor
ZpPxp TIL about the 'Pando', the Trembling Giant: Earth's Largest Organism
wLmYY TIL The international parking sign was first designed for the 1928 Summer Olympics in Amsterdam