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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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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Holding hands with someone you love can alleviate physical pain as well as stress and fear.
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The single biggest predictor of love is proximity.
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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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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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People are more likely to tilt their heads to the right when kissing instead of the left (65 percent of people go to the right!)
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