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TIL the saying "cats out of the bag" comes from when in medieval times, they would sell pigs in bags. Sometimes a seller would put a cat in the bag instead of a pig to trick the buyer. When the buyer opened up the bag, the cat would scurry out of the bag, as in the secret is out.

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BgNMe TIL that dogs have glands in their toes that release profile-specific scents when they dig into the ground— which is why they often scratch/ dig at the ground after urination. This is a way to further strengthen their “mark” on the territory.
QNaDE TIL: That human cells make up only 43% of the body's total cell count. No matter how well you wash, nearly every nook and cranny of your body is covered in microscopic creatures. The greatest concentration of this microscopic life is in the dark murky depths of our oxygen-deprived bowels.
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