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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For Valentine's Day 2014, an unnamed man sabotaged a special screening of "Beijing Love Story" at a Shanghai cinema by booking every other seat, subsequently preventing couples from sitting together.
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Parents receive 1 out of every 5 Valentines.
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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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When dragonflies mate, their tails form a love heart.
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Men who kiss their wives in the morning live five years longer than those who don't.
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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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