In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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Sea otters hold hands while sleeping so they don’t drift away from each other.
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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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A couple had their wedding rings engraved with a waveform of their own voices saying "I do."
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Men fall in love faster than women do.
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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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A Korean man called Lee Jin-gyu fell in love with his large, huggable pillow and married it.
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