Men who kiss their wives in the morning live five years longer than those who don't.
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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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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 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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Close to 110 million roses (mostly red) will be purchased and delivered around Valentine's Day in the U.S.
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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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When dragonflies mate, their tails form a love heart.
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