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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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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When someone looks at a new love, the neural circuits that are usually associated with social judgment are suppressed.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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Speed dating was invented by a Rabbi in 1999.
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You burn 26 calories in a one minute kiss.
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Parents receive 1 out of every 5 Valentines.
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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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