Holding hands with someone you love can alleviate physical pain as well as stress and fear.
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Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
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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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Kissing an infection-free partner is good for your teeth!
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Two in five people in the world marry their first love.
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Couples' personalities converge over time to make partners more and more similar.
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