Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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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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If you mouth the word "colorful" to someone, it looks like you are saying "I love you".
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Holding hands with someone you love can alleviate physical pain as well as stress and fear.
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A couple had their wedding rings engraved with a waveform of their own voices saying "I do."
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When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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Gary Kremen, founder of match.com, lost his girlfriend to a man she met on match.com.
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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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