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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Wearing red increases attraction.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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When you fall in love, that 'high' feeling is caused by a flood of dopamine that is similar to that of cocaine.
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In medieval Italy, if a man was caught kissing a woman in public, he had to marry her whether he liked it or not.
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In 1999, a fisherman found a love letter in a bottle from a soldier in WWI. He returned said letter to the now deceased widows 86 year old daughter.
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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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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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