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 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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Couples' personalities converge over time to make partners more and more similar.
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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Historically, sweat has been an active ingredient in perfume and love potions.
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When you fall in love, that 'high' feeling is caused by a flood of dopamine that is similar to that of cocaine.
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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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It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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