Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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Men who kiss their wives in the morning live five years longer than those who don't.
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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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Speed dating was invented by a Rabbi in 1999.
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The average person will go on a date at least 100 times before they finally marry.
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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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Historically, sweat has been an active ingredient in perfume and love potions.
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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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