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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When someone looks at a new love, the neural circuits that are usually associated with social judgment are suppressed.
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When dragonflies mate, their tails form a love heart.
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8 out of 10 people think that the first kiss indicates how the rest of the relationship will be.
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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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You burn 26 calories in a one minute kiss.
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