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TIL that your body smells when it's stressed and your dog can sniff it out

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KJ5R TIL James Buchanan Duke is credited as the inventor of the cigarette, made billions, and Duke University is named in his honor.
pYRRN TIL that nature often follows the Fibonacci sequence, AKA the golden ratio. Flowers follow this sequence is several ways, including the number of petals a flower has (Lily 3, Buttercups 5, daisies 34) and the distribution of seeds, such as the sunflower, who’s seeds form a perfect spiraling pattern.
wG0Y TIL: Frank Zamboni and his brother Lawrence owned and operated a block ice business, but with the advent of the electric refrigerator, they knew their days were numbered. They opened an ice rink instead, which led to Frank’s invention of a machine for resurfacing the ice
jnVR TIL measuring 4086mi^2, the largest salt pan Salar de Uyuni in Bolivia is so flat that rain can’t drain, creating the world’s largest natural mirror. It’s also 5x better for satellite calibration than the surface of the ocean, and an elevation measurement accuracy of 0.8 inches
OGQVa TIL in 1837 a blacksmith and tool maker in Illinois was gaining attention over his innovations to the plow. His self cleaning steel headed plow tilled the tough midwest soil with ease and aided the migration into the Great Plain. That blacksmith's name was John Deere.