Close to 110 million roses (mostly red) will be purchased and delivered around Valentine's Day in the U.S.
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Historically, sweat has been an active ingredient in perfume and love potions.
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Couples' personalities converge over time to make partners more and more similar.
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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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'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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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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Wearing red increases attraction.
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There's a love mattress that is specifically designed for couples who sleep on each other's arms.
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