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TIL threatening the President of the United States is a class E felony under United States CodeTitle 18, Section 871. The offense is punishable by up to 5 years in prison, a $250,000 maximum fine, a $100 special assessment, and 3 years of supervised release and some internet restrictions

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b1m0 TIL of a species of Sea Cow over 10 times the size of Manatees that Europeans hunted to extinction in just 27 years
mxZax TIL Research shows that developing resilience and fighting back against anxiety can be a matter of "unlearning learned helplessness."
8a988 TIL that Kyoto was actually at the top of the list of targets for the atomic bomb, not Nagasaki nor Hiroshima. Secretary of War Henry Stimson ordered for the ancient city with its thousands of palaces, temples, and shrines to be removed from the list, but the military kept on putting it back.
JYobj TIL in 2016, a flight was delayed because a passenger grew concerned and alerted the authorities about the suspicious scribbles of her curly, dark-haired seatmate. Upon inspection, it turned out that the seatmate was an Italian, who was a UPenn economics professor solving differential equations.
EgMEV TIL Salmon sperm DNA is used in molecular biology experiments as a standard or template for PCR and as a competitor in hybridisation assays due to its high purity. It can even increase the human DNA recovered from a cotton swab.