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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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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Close to 110 million roses (mostly red) will be purchased and delivered around Valentine's Day in the U.S.
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A poll has found that computer 'nerds' make the best lovers, with 82 percent of IT geeks claiming they put their partner's pleasure above their own.
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Historically, sweat has been an active ingredient in perfume and love potions.
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Raj from the Big Bang Theory is married to Miss India.
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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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