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smilestrengthmomentcamefroma2010WayneStateUniversityresearchprojectthatlookedintopre-1950sbaseballcardsofMajorLeagueplayersTheresearchersfoundthataspan（程度）ofaplayer’ssmilecouldactuallythespanofhislifesmilingpredictslongevity607080weareactuallybornsmilingUsing3Dultrasoundtechnology（三维超声波技术）,wecannowseethatdevelopingbabiesappeartosmile,eveninthewomb（子宫）Whentheyareborn,babiescontinuetosmileinitially,mostlyintheirsleep.AndevenblindbabiessmiletothesoundofthehumanvoiceSmilingisoneofthemostbasic,biologically-uniformexpressionsofallhumansPaulEkmanfoundthatevenmembersoftheForetribe（原始部落）whowerealsoknownfortheirunusualcannibalismrituals（食人习性）,attributedsmilestodescriptionsofsituationsthesamewayyouandIwouldwesmileoften,andyousmiletoexpressjoyandsatisfactionThosewiththemostamazingsuperpowersareactuallychildren,whosmileasmanyas400timesperdaySmile+frown=smileWhy:it’sverydifficulttofrown(皱眉)whenlookingatsomeonewhosmiles.Because:smilingisevolutionarilycontagious（感染力极强）,anditsuppresses（抑制）thecontrolweusuallyhaveonourfacialmusclesMimicking(模拟)asmileandexperiencingitphysicallyhelpusunderstandwhetheroursmileisfakeorreal,sowecanunderstandtheemotionalstateofthesmilerInadditiontotheorizingonevolutionin“TheOriginofSpecies,”CharlesDarwinalsowrotethefacialfeedbackresponsetheory（面部反馈理论）“Eventhesimulationofanemotiontendstoarouseitinourminds.”CharlesDarwin,1872Darwinactuallycited(引用)aFrenchneurologist(神经学家),GuillaumeDuchenne,whousedelectricjolts(电颤刺激)tofacialmusclestoinduceandstimulate(刺激)smiles.Please,donottrythisathome！ResearchersusedfMRIimaging（核磁共振成像）tomeasurebrainactivitybeforeandafterinjectingBotox（注射肉毒杆菌）tosuppress（抑制）smilingmuscles.support：thefacialfeedbackresponsetheorySmilingstimulates（刺激）ourbrainrewardmechanism（机制）inawaythatevenchocolateawell-regarded（公认的）pleasureinducer（开心秘方）cannotmatchOnesmile=2000Onesmile=16000makeyouhealthierreducethelevelofstress-enhancinghormonesincreasethelevelofmood-enhancinghormonesreduceoverallbloodpressureyousmileYoulookandfeelgoodOthersseeyousmileTheymimicandsmileTheylookandfeelgoodsmilingcanactuallymakeyoulookgoodintheeyesofothers“Iwillneverunderstandallthegoodthatasimplesmilecanaccomplish.”MotherTeresaThankyouthankyou!