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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Close to 110 million roses (mostly red) will be purchased and delivered around Valentine's Day in the U.S.
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Falling in love raises levels of nerve growth in a person's brain for about a year and can improve their memory.
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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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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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Ten seconds of hugging a day increases levels of oxytocin, which can reduce blood pressure, thus cutting the risk of heart disease.
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As a rule, 66 percent of people keep their eyes closed while kissing. The rest take pleasure in watching the emotions run the gamut on the faces of their partners.
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