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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40% of people who are rejected in romantic love slip into clinical depression.
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It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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Historically, sweat has been an active ingredient in perfume and love potions.
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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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The average person will go on a date at least 100 times before they finally marry.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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