Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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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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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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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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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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