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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It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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In Korea, if you do not receive any gift on Valentine's day then all the singles go to Korean restaurants and eat black noodles to celebrate (or mourn) their single status.
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The typical person spends about 600 hours having sex between the ages of 20 and 70.
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'X' became symbolic for a kiss because in the middle ages when alot of people were illiterate and they used to sign documents with an X and then kiss it for sincerity.
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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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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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