In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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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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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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Erotomania is a type of delusion in which the person believes another person is in love with him/her.
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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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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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It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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