In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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When dragonflies mate, their tails form a love heart.
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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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It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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Couples' personalities converge over time to make partners more and more similar.
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A poll has found that computer 'nerds' make the best lovers, with 82 percent of IT geeks claiming they put their partner's pleasure above their own.
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The average person in their lifetime will spend an estimated 20,160 minutes kissing!
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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