Two in five people in the world marry their first love.
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Sea otters hold hands while sleeping so they don’t drift away from each other.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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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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You burn 26 calories in a one minute kiss.
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Couples' personalities converge over time to make partners more and more similar.
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The single biggest predictor of love is proximity.
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In Korea, if you do not receive any gift on Valentine's day then all the singles go to Korean restaurants and eat black noodles to celebrate (or mourn) their single status.
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