Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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Close to 110 million roses (mostly red) will be purchased and delivered around Valentine's Day in the U.S.
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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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40% of people who are rejected in romantic love slip into clinical depression.
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When someone looks at a new love, the neural circuits that are usually associated with social judgment are suppressed.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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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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