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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In Korea, if you do not receive any gift on Valentine's day then all the singles go to Korean restaurants and eat black noodles to celebrate (or mourn) their single status.
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Gary Kremen, founder of match.com, lost his girlfriend to a man she met on match.com.
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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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Speed dating was invented by a Rabbi in 1999.
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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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