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From potential health supplement to quintessential Valentine's Day gift, what makes chocolate so special? Stanford researchers explain the science and economics behind the sweet treat.

United statesChristopher gardnerCarter rosenthalMars wrigleyMiltons hersheyDaniella lumkongOlga khessinaJeff beckmanJohn hongStanford prevention research centerUniversity of illinois urbana champaignRicker dining hallMarkus covertIllinois urbana champaign