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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When you fall in love, that 'high' feeling is caused by a flood of dopamine that is similar to that of cocaine.
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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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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
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Couples' personalities converge over time to make partners more and more similar.
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Holding hands with someone you love can alleviate physical pain as well as stress and fear.
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