Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
13
When someone looks at a new love, the neural circuits that are usually associated with social judgment are suppressed.
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The single biggest predictor of love is proximity.
30
40% of people who are rejected in romantic love slip into clinical depression.
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A man's beard grows fastest when he anticipates sex.
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