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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Historically, sweat has been an active ingredient in perfume and love potions.
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Speed dating was invented by a Rabbi in 1999.
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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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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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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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'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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In Korea, if you do not receive any gift on Valentine's day then all the singles go to Korean restaurants and eat black noodles to celebrate (or mourn) their single status.
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