In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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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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When dragonflies mate, their tails form a love heart.
22
Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
14
Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
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In 2010, Gary Richmond was beaten into a coma. He woke up with amnesia and no memory of his wife of 20 years. Subsequently, he ended up falling in love with her all over again!
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It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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