Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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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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The average person in their lifetime will spend an estimated 20,160 minutes kissing!
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People are more likely to tilt their heads to the right when kissing instead of the left (65 percent of people go to the right!)
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It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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Couples' personalities converge over time to make partners more and more similar.
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Parents receive 1 out of every 5 Valentines.
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