Close to 110 million roses (mostly red) will be purchased and delivered around Valentine's Day in the U.S.
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When dragonflies mate, their tails form a love heart.
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The single biggest predictor of love is proximity.
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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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When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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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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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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Erotomania is a type of delusion in which the person believes another person is in love with him/her.
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