Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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Couples' personalities converge over time to make partners more and more similar.
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Men who kiss their wives in the morning live five years longer than those who don't.
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When someone looks at a new love, the neural circuits that are usually associated with social judgment are suppressed.
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It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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There's a love mattress that is specifically designed for couples who sleep on each other's arms.
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'X' became symbolic for a kiss because in the middle ages when alot of people were illiterate and they used to sign documents with an X and then kiss it for sincerity.
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