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TIL that Lewis and Clark Expedition participant and War of 1812 veteran, Patrick Gass, had to be removed from a recruiting station after attempting to enlist in the Union Army to fight in the American Civil War at the age of 91.

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wogY8 TIL about Ultrasonic cross-device tracking. Audio "beacons" can be embedded into television advertisements. In a similar manner to radio beacons, these can be picked up by smartphones, which allows the behavior of users to be tracked. Humans can't hear these sounds at all.
OE04 TIL Originally it was suggested the scroll on the Victoria Cross, Britain’s most prestigious military award, should bear the legend ‘FOR THE BRAVE’ but Queen Victoria herself changed this to ‘FOR VALOUR’ as the former implied that not all Soldiers were brave.
LZXZ TIL of Otokichi, a Japanese castaway who made landfall in America after surviving for over a year at sea. He was enslaved by the Makah Native American tribe, but eventually found his way to London and joined the British fleet, where he helped negotiate the Anglo-Japanese friendship treaty.
QN946 TIL that during the Middle Ages, animals were judged as if they were humans. It was even possible to sue any kind of animal, and authorities would catch and bring them to trial. They would then receive a sentence based on the alleged crime committed.
kJp45 TIL In March 12, 1961, a character named Dennis the Menace debuted in the British comic “The Beano", a few hours later, an unrelated newspaper comic was released in the USA, with the character also being called Dennis the Menace.