In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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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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In medieval Italy, if a man was caught kissing a woman in public, he had to marry her whether he liked it or not.
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Speed dating was invented by a Rabbi in 1999.
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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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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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Historically, sweat has been an active ingredient in perfume and love potions.
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Couples' personalities converge over time to make partners more and more similar.
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