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TIL The American Dental Association supports chewing sugarless gum since it increases salivary volume and flow, thus protecting against cavities.

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X0ER TIL During the Cold War, the US military developed a rifle that fired nuclear war heads. It was called the Davy Crocket.
p8ygN TIL that the well-known 'ugly' blob fish (the one with the nose) only looks like that when they are pulled out from the high pressure environments such as deep beneath the oceans up to the surface. The pressure change results in tissue damage which makes the fish look like it's melting.
PYj4Z TIL that Goose bumps evolved to make our ancestors’ hair stand up, making them appear more threatening to predators.
Z8V7Y TIL of Michael Orchard, a heroic man who broke into his neighbor's burning home to rescue their dog, and who later found out that the house fire was actually NOT real but was just a hallucination from the LSD he was consuming.
dxnQ TIL that, in 1957, a terminal cancer patient was given a worthless drug that caused his tumors to “melt like snowballs on a hot stove.” When he found out it was proven worthless, his cancer returned. He was given a placebo version and it went away again. He learned the truth, then died soon after.