Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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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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Erotomania is a type of delusion in which the person believes another person is in love with him/her.
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Raj from the Big Bang Theory is married to Miss India.
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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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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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Twenty nine percent of women spend more time shopping for shoes than they do looking for a life long mate.
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Wearing red increases attraction.
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