Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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According to the New York Times, a study conducted during the 1980's found that men who kiss their wives before leaving for work live longer, get into fewer car accidents, and have a higher income than married men who don't.
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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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Men fall in love faster than women do.
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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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When you fall in love, that 'high' feeling is caused by a flood of dopamine that is similar to that of cocaine.
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Couples' personalities converge over time to make partners more and more similar.
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The average person will go on a date at least 100 times before they finally marry.
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