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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You burn 26 calories in a one minute kiss.
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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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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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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Falling in love raises levels of nerve growth in a person's brain for about a year and can improve their memory.
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People are more likely to tilt their heads to the right when kissing instead of the left (65 percent of people go to the right!)
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