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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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
4
A man's beard grows fastest when he anticipates sex.
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Holding hands with someone you love can alleviate physical pain as well as stress and fear.
26
Two in five people in the world marry their first love.
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Couples' personalities converge over time to make partners more and more similar.
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