Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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In medieval Italy, if a man was caught kissing a woman in public, he had to marry her whether he liked it or not.
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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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Erotomania is a type of delusion in which the person believes another person is in love with him/her.
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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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If you mouth the word "colorful" to someone, it looks like you are saying "I love you".
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In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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A Korean man called Lee Jin-gyu fell in love with his large, huggable pillow and married it.
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