When dragonflies mate, their tails form a love heart.
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When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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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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Two in five people in the world marry their first love.
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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