Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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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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Gary Kremen, founder of match.com, lost his girlfriend to a man she met on match.com.
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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 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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Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
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