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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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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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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In medieval Italy, if a man was caught kissing a woman in public, he had to marry her whether he liked it or not.
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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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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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