Close to 110 million roses (mostly red) will be purchased and delivered around Valentine's Day in the U.S.
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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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Brain scans show that people who view photos of a beloved experience an activation of the caudate - the part of the brain involving cravings.
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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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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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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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Couples' personalities converge over time to make partners more and more similar.
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Speed dating was invented by a Rabbi in 1999.
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