A Korean man called Lee Jin-gyu fell in love with his large, huggable pillow and married it.
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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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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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Close to 110 million roses (mostly red) will be purchased and delivered around Valentine's Day in the U.S.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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In 2012, a Chinese man named Xiao Fan had a dress made out of 9,999 red roses for his girlfriend and then proposed - 9 in China means forever
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The single biggest predictor of love is proximity.
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Studies show that the risk of a “secret love” being revealed heightens romantic feelings for the partners, thanks to increased levels of phenylethylamine (PEA).
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