Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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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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In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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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.
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You burn 26 calories in a one minute kiss.
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Wearing red increases attraction.
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