Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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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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Holding hands with someone you love can alleviate physical pain as well as stress and fear.
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One in five long-term love relationships began with one or both partners being involved with others.
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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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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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40% of people who are rejected in romantic love slip into clinical depression.
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Gary Kremen, founder of match.com, lost his girlfriend to a man she met on match.com.
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