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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Erotomania is a type of delusion in which the person believes another person is in love with him/her.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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In Korea, there's a man named Lee Jin-gyu who fell in love and married his life-sized Japanese body pillow (called a "dakimakura").
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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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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Close to 110 million roses (mostly red) will be purchased and delivered around Valentine's Day in the U.S.
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