Parents receive 1 out of every 5 Valentines.
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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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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 man's beard grows fastest when he anticipates sex.
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Speed dating was invented by a Rabbi in 1999.
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Brain scans show that people who view photos of a beloved experience an activation of the caudate - the part of the brain involving cravings.
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Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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