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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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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Couples' personalities converge over time to make partners more and more similar.
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Speed dating was invented by a Rabbi in 1999.
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The left ear is more responsive to words of love and emotion whispered into it than the right.
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People are more likely to tilt their heads to the right when kissing instead of the left (65 percent of people go to the right!)
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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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