Scientific American August 2003 (tdr).pdf

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1、RETHINKINGTHELESSERBRAIN•THEVAPORSOFPROPHECYWhytheDigitalDivideDoesNotComputeAUGUST2003$4.95WWW.SCIAM.COMCOPYRIGHT2003SCIENTIFICAMERICAN,INC.contentsaugust2003SCIENTIFICAMERICANVolume289Number2featuresBIOTECHNOLOGY34CensorsoftheGenomeBYNELSONC.LAUANDDAVIDP.BARTELBiotechnologistsseeknewth

2、erapiesforcancerandotherailmentswiththehelpofarecentlydiscoverednaturalmechanismforturningoffgenes.INFORMATIONTECHNOLOGY42DemystifyingtheDigitalDivideBYMARKWARSCHAUERHandingoutcomputersandInternetaccessisthewrongwaytoraisetechnologicalliteracy.NEUROSCIENCE50Rethinkingthe“LesserBrain”BYJA

3、MESM.BOWERANDLAWRENCEM.PARSONSThecerebellumdoesmorethancoordinatebodymovement.Italsoweavestogethersignalsfromthesenses.PHYSICS58InformationintheHolographicUniverseBYJACOBD.BEKENSTEINTheoreticalworkonblackholessuggeststhattherearelimitstohowdenselyinformationcanbepacked—andthatouruniverse

4、mightbelikeagianthologram.ARCHAEOLOGY66QuestioningtheDelphicOracleBYJOHNR.HALE,JELLEZEILINGADEBOER,JEFFREYP.CHANTONANDHENRYA.SPILLERTheancientGreekswereright:vaporsfromtheearthinspiredtheseer’sprophetictrances.EVOLUTION74PlanetoftheApesBYDAVIDR.BEGUNTheOldWorldwashometoasmanyas100species

5、ofapes,andthosethatgaverisetousmaynothavelivedinAfricaafterall.66MysteryoftheoraclesolvedCOPYRIGHT2003SCIENTIFICAMERICAN,INC.departmentsSCIENTIFICAMERICANVolume289Number210SAPerspectivesMakingspacesafefromthegroundup.12HowtoContactUs12OntheWeb218814Letters1850,100&150YearsAgo30Innovation

6、s20NewsScanGrabbingparticleswithlightleadstoanewformofnanomanufacturing.■GlobalwarmingintheMiddleAges.■VIRGOsearchesforgravitywaves.32StakingClaims■Labeling“inert”ingredientsinpesticides.Asourremedyfortreatingangina,and■Nextstop,theearth’score.moreoddpatents.■RootingHomosapiensinAfrica.8

7、4Insights■BytheNumbers:Futurepowershortages.Doubtersscoff,butasteroidwatcherBrianMarsden■DataPoints:VideogamesenhancewatchesforArmageddonfromtheskies.visualprocessing.86WorkingKnowledgeSeeinginthedark.88TechnicalitiesNewdevicesconnectthestereoandTVBrianMarsden,Smithsonian