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ScientificAmerican;performance.mark('app-load-start');((d,ael,dcl,unl,cxl,log,onunl)=>{log('[readyState]',d.readyState);d[ael]('readystatechange',()=>log('[readyState]',d.readyState));d[ael](dcl,()=>log(dcl));d[ael](unl,onunl);window.onload=()=>{d.removeEventListener(unl,onunl);log('windowloaded')};})(document,'addEventListener','DOMContentLoaded','beforeunload','cancelled',(...msg)=>console.log('[dev]',...msg),()=>{window[cxl]=true;log(cxl)});((l,pii)=>{if(pii.some(p=>l.search.includes(p+"="))){window.initSearch=l.search;constanon=newURLSearchParams(l.search);pii.forEach(p=>anon.delete(p));history.replaceState({},"",l.pathname+"?"+anon);}})(location,["email","mic_link","token","code","state"]);SkiptomaincontentScientificAmericanScientificAmericanPublicHealthNovember27,2024WhattheEvidenceSaysAboutFluorideinDrinkingWater RFK,Jr.,andotherpotentialandcurrentgovernmentofficialshespreadshakyhealthclaimsaboutfluoridatedwater.ScientistsexplaintheevidencebehinditssafetyandbenefitsSaimaS.IqbalNutritionNovember18,2024It’sActuallyHealthiertoEnjoyHolidayFoodswithouttheAnxietyAllisonParshallPsychologyNovember27,2024APsychologist’sTipsforoidingOverconsumptionThisHolidaySeasonRachelFeltman,FondaMwangiLangueNovember27,2024Ouch!LinguistsFindUniversalLangueforPainAllisonParshallGamesNovember27,2024Spellements:Wednesday,November27,2024SarahLewinFrasier$0forDigitalAccessReadallthestoriesyouwant.MicrobiologyNovember27,2024YourFriendsShapeYourMicrobiome—andSoDoTheirFriendsSaimaSidik,NaturemazineOpinionNovember27,2024ChoosingEmpathyIsCriticaltoDemocracyC.DarylCameronEpidemiologyNovember27,2024WhattoKnowaboutWalkingPneumoniainKidsMeghanBartelsClimateChangeNovember27,2024WhatMakestheEasternU.S.DroughtDifferentfromtheWest’sAndreaThompsonExploreTopicsHealthMind&BrainEnvironmentTechnologySpace&PhysicsBiologyMathChemistrySocialSciencesVideosPodcastsOpinionGamesReportsViewAllStoriesDecember2024IssueArchaeologyTheSurprisingNewHistoryofHorseDomesticationWilliamT.TaylorMathematicsMathematiciansDiscoveraNewKindofShapeThat’sAlloverNatureEliseCuttsClimateChangeCouldEngineeringtheOceanHelpStopClimateChange?JaimeB.PalterMentalIllnessHypochondriaIsaRealandDangerousIllness,NewResearchShowsJoanneSilbernerSustainabilityShouldOffshoreOilRigsBeTurnedintoArtificialReefs?AsherRadzinerPsychologyHittingtheCuriositySweetSpotSpeedsUpLearningLydiaDenworthViewFullIssueExploreArchiveGamesSpellementsCreateasmanywordsasyoucanMathPuzzlesStretchyourmathmuscleswiththesepuzzlesAllGamesScienceinspiredgames,puzzlesandquizzesGetOurDailyNewsletterIreemyinformationwillbeprocessedinaccordancewiththeScientificAmericanandSpringerNatureLimitedPrivacyPolicy.SignUpThankyouforsigningup! CheckoutourothernewslettersPodcastsNovember27,2024APsychologist’sTipsforoidingOverconsumptionThisHolidaySeasonRachelFeltman,FondaMwangiPublicHealthNovember25,2024RFK,Jr.,CouldRuntheencyThatOverseesCDC,FDAandNIH.Here’sWhatThatMeansforPublicHealthRachelFeltman,TanyaLewis,JefferyDelViscio,FondaMwangi,AnaissaRuizTejadaTechnologyNovember22,2024CouldAIGhostsofAncientCivilizationsHelpUsConnectwithBygoneCultures?RachelFeltman,FondaMwangi,JefferyDelViscioHealthNovember20,2024UnscheduledC-SectionsMayDependontheColorofYourSkinRachelFeltman,FondaMwangi,JefferyDelViscioClimateChangeNovember18,2024AnOffDayinBrooklyn—AndonUranusRachelFeltman,AndreaThompson,AlecLuhn,FondaMwangi,MadisonGoldbergMorePodcastsPopularStoriesMathematicsNovember19,2024MathematiciansDiscoveraNewKindofShapeThat’sAlloverNatureMathematicianshefoundanewkindofshapewithconnectionstonatureandartEliseCuttsEvolutionNovember1,2023TheTheoryThatMenEvolvedtoHuntandWomenEvolvedtoGatherIsWrongTheinfluentialideathatinthepastmenwerehuntersandwomenwerenotisn’tsupportedbytheailableevidenceCaraOcobock,SarahLacyArchaeologyNovember22,2024World’sOldestAlphabetFoundonanAncientClayGiftTAfinger-sizedclaycylinderfromatombinnorthernSyriaappearstobetheoldestexampleofwritingusinganalphabetratherthanhieroglyphsorcuneiformStephaniePappasTheUniverseNovember22,2024WhyIstheSkyDarkatNight?YouCanThanktheBigBangCalledOlbers’paradox,theseeminglysimplemysteryofthesky’sdarknessissomethingthatstumpedastronomersforcenturiesPhilPlaitStressNovember25,2024HowHumorTaScientific American: Science News, Expert Analysis, Health ResearchkestheEdgeoffHardTimesWhenlifefeelsdifficult,humorcanbeacopingmechanismthatrelievesstressandoffersthebreathingroomtokeepgoing,scientistssayMeghanBartelsOpinionNovember26,2024HowtheReturnofSalmontotheKlamathRiverShowsUsWhat’sPossibleinWildlifeConservationOnceatricexampleofdegradedwildlifehabitat,theKlamathRiver’sdamremovaldemonstrateshowpeoplecanhaltthedeclineof,andevenrestore,wildlifeJeffOppermanViewAllStoriesExpandYourWorldwithScienceLearnandsharethemostexcitingdiscoveries,innovationsandideasshapingourworldtoday.SubscribeSignupforournewslettersSeethelateststoriesReadthelatestissueGiveaGiftSubscriptionFollowUs:Return&RefundPolicyAboutPressRoomFAQsContactUsInterScientifScientific American: Science News, Expert Analysis, Health Researchic American: Science News, Expert Analysis, Health 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