Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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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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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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Raj from the Big Bang Theory is married to Miss India.
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Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
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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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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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8 out of 10 people think that the first kiss indicates how the rest of the relationship will be.
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