A Korean man called Lee Jin-gyu fell in love with his large, huggable pillow and married it.
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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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Gary Kremen, founder of match.com, lost his girlfriend to a man she met on match.com.
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Couples' personalities converge over time to make partners more and more similar.
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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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You burn 26 calories in a one minute kiss.
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It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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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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