It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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Raj from the Big Bang Theory is married to Miss India.
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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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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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The left ear is more responsive to words of love and emotion whispered into it than the right.
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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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In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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