Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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In 1999, a fisherman found a love letter in a bottle from a soldier in WWI. He returned said letter to the now deceased widows 86 year old daughter.
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Couples' personalities converge over time to make partners more and more similar.
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Historically, sweat has been an active ingredient in perfume and love potions.
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Studies show that the risk of a “secret love” being revealed heightens romantic feelings for the partners, thanks to increased levels of phenylethylamine (PEA).
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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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Men who kiss their wives in the morning live five years longer than those who don't.
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It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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