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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One in five long-term love relationships began with one or both partners being involved with others.
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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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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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Brain scans show that people who view photos of a beloved experience an activation of the caudate - the part of the brain involving cravings.
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Wearing red increases attraction.
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When dragonflies mate, their tails form a love heart.
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Two in five people in the world marry their first love.
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