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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Gary Kremen, founder of match.com, lost his girlfriend to a man she met on match.com.
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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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For Valentine's Day 2014, an unnamed man sabotaged a special screening of "Beijing Love Story" at a Shanghai cinema by booking every other seat, subsequently preventing couples from sitting together.
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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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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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