Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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A Korean man called Lee Jin-gyu fell in love with his large, huggable pillow and married it.
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Parents receive 1 out of every 5 Valentines.
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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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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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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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Ten seconds of hugging a day increases levels of oxytocin, which can reduce blood pressure, thus cutting the risk of heart disease.
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In Korea, if you do not receive any gift on Valentine's day then all the singles go to Korean restaurants and eat black noodles to celebrate (or mourn) their single status.
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