It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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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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Two in five people in the world marry their first love.
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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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Couples' personalities converge over time to make partners more and more similar.
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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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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 2010, Gary Richmond was beaten into a coma. He woke up with amnesia and no memory of his wife of 20 years. Subsequently, he ended up falling in love with her all over again!
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