Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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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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It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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Historically, sweat has been an active ingredient in perfume and love potions.
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When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
25
Couples' personalities converge over time to make partners more and more similar.
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Close to 110 million roses (mostly red) will be purchased and delivered around Valentine's Day in the U.S.
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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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