Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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Kissing an infection-free partner is good for your teeth!
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When dragonflies mate, their tails form a love heart.
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Close to 110 million roses (mostly red) will be purchased and delivered around Valentine's Day in the U.S.
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Historically, sweat has been an active ingredient in perfume and love potions.
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Two in five people in the world marry their first love.
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Couples' personalities converge over time to make partners more and more similar.
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It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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