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“quiettime.”IThisrecordingProvidesbackgroundnoise(suchasthesoundoftheair-conditioningandtraffic)sothatlatershecansubtractthatsoundtomaketheimportantbits(Suchasconversation)standout.OurbraineditsinputlikeaProfessionalsoundtechnician.Itfltersoutnoise，smells，andother“background”stimulisothatnevwandpotentiallysignicantstimulicaneasilybedetected.Ihiscanbeimportantforsurvival.Consideradogthathasbeenjyingforhoursinarose-filledgarden.Thedog\'solfactoryneuronsceasedrespondingtotheconstantsmellofrosesawhileago，whichmakesitmucheasierforthedogtodetectthefaintscentofthecoyotethatisquicklyapproaching.也Thisisallwellandgood.Theproblememergeswhenthebrainfltersoutsome“backgroundstimulus”thatisnotinnocuous，butiskillingusveryveryveryslowly.AFROGWILLJUMP人F太CANItallbeganin1869whenFriedrichGoltz,aGermanphysiologist,setouttofindthephysicallocationofthesoul.Hesuspecteditresidedinthebrain.Iotesthishypothesis,heconductedanexperimentwithtwofrogs.Onefrogwashealthyintact,andslimy.Theotherwasalsoslimybuthadhaditsbrainremoved.GoltzPlaced由embothinalargepotofwater,whichhethenraisedtoaboilslowly芋Guesswhathappenednext?Indeed,thefrogwithoutab

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rainremainedinthepot.AfrogwithoutanervousSystemcannotjump.Theintactfrogescapedthepotwithanimpressivehopwhenthewaterreached25\"C(77\"F).Yebafewyeatsjater,twoadditionalstudies,conductedbyscientistsnamedHeinzmannandFratscher，foundconflictingresults一namely，thatperfectlyintactfrogsdidnotttrytoescapeapotofboilingwateraslongasitwasheatedgradually和所ThefrogssoakedobliviouslyinthewaterunawarethatthetemperaturewasgraduallyrisingUntilitwastoojate.WhythesetwoscientistsobserveddiferentresultsfromGoltzisunclear.Regardless，theboilingfrogquicklybecameametaphorforthedangerofdetrimentalchangesthathappenslowlywithclimatechangebeingaProminentexample.Whenyetmorestudieswereconducted,Goltzwasfoundtoberightafterall.ThefrogzzLchangelocationwhenthewaterreachesacertaintemperatureregardlessofhowgradualtheincreaseis.红ThisledtoaPassionatedebateaboutwhetheritwas,orwasnobacceptabletousetheboiling-frogtaleasananalogytothehumancondition.NobelPrizewinners所andNe了苔7iRT7zzzeybestsellingauthors急haveexpressedStrongopinionsonthematter.SomeSayno，itisinappropriatetousethisanalogygiventhatweknowthatthefrogw记jumpoutofthewater(assumingithasanintactbrain

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).OthersSayitisfinetousetheanalogy计itisclearlystatedthatscientificevidenceshowsthatthefrogw记escapethepotintime.绎Wesuggestanewtwisttotheboiling-frogtale,whichmightbeacceptabletoall.ThefrogisPlacedinapotofwaterthatisheatedgradually.Sophisticatedcreaturethatitis,thefrogjumpsoutofthewaterbeforeitboilstodeath,onlytodiscoverthatthepotisfoatingonalargebodyofwaterthatisitselfcomingtoaboilveryveryslowly.ThereisnowheretogolWARM,WARMER,HOTHOTTER,BURNINGAmphibiansaside，w记刁ozzoyajpzezxfoatcalmlyinahotpotaslongasthetemperaturerisesSlowlyorw训Peoplescreamandshout?AgroupofscientistsfromMIT,UCDavis,Vancouver,andBoulderturnedtoTwitterforanswers.包Theywonderedwhetherpeoplewouldnoticedisturbingweathertrendswhentheyoccurredgradually.IPeopleareinclinedtotwistandshout,surelyTwitterwouldbethePlacetheywouldgotodoso.ImagineyoujliveinLondonandexperienceadaywhenthetemperatureisPrettywarmSay32?\"C(~90\"F).Youcanbetthateveryonewillbecommentingontheweather.Incontrast,让youwereinDubai,noonewouldmentiona32?Cdaywthoughasnowfurrywouldcertainlycauseabuzz.Peoplenoticeandtalkabouttheweather让itstandsouttelativetowhattheyareUsedto一让ifisSUrprising.

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