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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In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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According to the New York Times, a study conducted during the 1980's found that men who kiss their wives before leaving for work live longer, get into fewer car accidents, and have a higher income than married men who don't.
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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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Couples' personalities converge over time to make partners more and more similar.
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In 2012, a Chinese man named Xiao Fan had a dress made out of 9,999 red roses for his girlfriend and then proposed - 9 in China means forever
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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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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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