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TIL The term "Slacker" first came to widespread use in America during World War I. It was used almost entirely to refer to young men who were attempting to dodge the military draft. Before 1917, it was used rarely. During 1917, it was so popular a film about a draft dodger was made with that title.

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kOZk5 TIL of Stubbins Ffirth who attempted to prove that Yellow Fever wasn't contagious by smearing vomit, blood, saliva, and urine from patients in open wounds on his arms. While he never got sick, it later emerged that the samples he used had come from late-stage patients who were no longer contagious
9YRgp TIL: In 1877, George Cowan got shot in the head, crawled to make coffee at an old camp, crawled thru Yellowstone, crossed a river, got burned in a forest fire, had surgery to remove bullets, got thrown from a carriage before it rolled over a cliff, and while receiving care afterwards, his bed broke
gMYQ7 TIL Mosquitoes love type O blood for no good reason. -- protect yourself with a goid insect repellent!
kJYn4 Til that Brenda Lee was only 13 years old when she recorded her Christmas hit 'Rockin' Around the Christmas Tree'
xVMmb TIL the Americas were never named after Christopher Columbus, because Columbus believed he had sailed across the Atlantic to India. Instead, the Americas were named after Amerigo Vespucci, the first person to suggest there was a new world.