Two in five people in the world marry their first love.
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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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A man's beard grows fastest when he anticipates sex.
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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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The single biggest predictor of love is proximity.
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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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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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In 2012, a Chinese man named Xiao Fan had a dress made out of 9,999 red roses for his girlfriend and then proposed - 9 in China means forever
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