Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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A man's beard grows fastest when he anticipates sex.
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When dragonflies mate, their tails form a love heart.
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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According to the New York Times, a study conducted during the 1980's found that men who kiss their wives before leaving for work live longer, get into fewer car accidents, and have a higher income than married men who don't.
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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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Ten seconds of hugging a day increases levels of oxytocin, which can reduce blood pressure, thus cutting the risk of heart disease.
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It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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