When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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Falling in love raises levels of nerve growth in a person's brain for about a year and can improve their memory.
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In Korea, there's a man named Lee Jin-gyu who fell in love and married his life-sized Japanese body pillow (called a "dakimakura").
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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People are more likely to tilt their heads to the right when kissing instead of the left (65 percent of people go to the right!)
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Rex the German Shepherd was a rescue dog with a bad temper. He refused to be fed by humans and would attack strangers, but he’s a changed dog after falling in love with Geraldine the goose!
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Gary Kremen, founder of match.com, lost his girlfriend to a man she met on match.com.
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Parents receive 1 out of every 5 Valentines.
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