Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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Erotomania is a type of delusion in which the person believes another person is in love with him/her.
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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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Two in five people in the world marry their first love.
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In Korea, there's a man named Lee Jin-gyu who fell in love and married his life-sized Japanese body pillow (called a "dakimakura").
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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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Twenty nine percent of women spend more time shopping for shoes than they do looking for a life long mate.
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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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