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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You burn 26 calories in a one minute kiss.
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Brain scans show that people who view photos of a beloved experience an activation of the caudate - the part of the brain involving cravings.
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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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There's a love mattress that is specifically designed for couples who sleep on each other's arms.
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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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Holding hands with someone you love can alleviate physical pain as well as stress and fear.
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