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TIL Dogs yawn to deflect a threat. If a person or another animal approaches a dog, that dog may avert his gaze and yawn. It's a dog's way of saying that he feels threatened or anxious

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a80Nb TIL: Ancient Greeks used beacons atop mountains for more than communication of something/nothing; beacons were used to communicate actual words.
gM0KA TIL the Great Pyramid of Giza has 8 sides, not 4.
vReD TIL: There are 18.6 million empty homes in America, meaning you could give every person in Scotland around three houses in America, and every homeless American around six houses.
P17yV TIL Tooth brushing only became widespread in the US after WWII, when returning soldiers continued the practice that had been required during their military service
xXVD TIL Native American women in the U.S. were apart of a forced sterilization government program. If they refused, they were sterilized without their knowledge during other routine surgeries.