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    Edward Bell

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    SUNRISE ON MERCURY ) (The Grand Tour )1(

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    Visionary ,"Scientifc American

    , April 1997Hugo Award )4(the Rudaux Memorial Award )5(

    Cassini Vir tual Tour. The Cassini atSaturn Interactive Explorer (CASSIE)lets you fy around Saturn and itsmoons in 3-D. You can locate thesatellite at any point in its mission.http://saturn.jpl.nasa.gov/video/ cassinivirtualtour/

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    Alexander S. Bradley

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    Once bel eved to be the smallest pathogens known, nano bac ter ahave now proved to be someth ng almost as strange.

    ASTRONOMY

    Cloudy with a Chance of StarsBy Erick T. Young

    Making a star is no easy thing. Astronomers are flling in gaps inthe standard v ew of how stars ar se.

    ENERGY

    Fusions False DawnBy Michael Moyer

    As a h stor c m lestone nears, skept cs quest on whether t w llever be poss ble to bu ld a work ng fus on reactor that couldsupply v rtually unl m ted clean energy.

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    ENViRONMENT

    Climate Change: A ControlledExperimentBy Stan D. Wullschleger and Maya Strahl

    Sc ent sts have man pulated grasslandsand forests to see how prec p tat on,carbon d ox de and temper ature changesw ll affect the future of the b osphere.

    EVOLUTiON

    The Naked TruthBy Nina G. Jablonski

    Recent fndings lay bare the originsof human ha rlessnessand h nt thatnaked sk n was a key factor n theemergence of other human tra ts.

    NEUROSCiENCE

    The Brains Dark EnergyBy Marcus E. Raichle

    Bra n reg ons act ve when we allowour m nds to wander may hold a key tounderstand ng neurolog cal d sordersand even consc ousness tself.

    EDiTOR iN CHiEF: Mariette DiChristinaMANAGING EDITOR: Ricki L. RustingCHIEF NEWS EDITOR: Philip M. YamSEnIor writeR: Gary StixEDITORS: Davide Castelvecchi,

    Graham P. Collins, Mark Fischetti,Steve M rsky, M chael Moyer, George Musser,Chr st ne Soares, Kate WongCONTRiBUTiNG EDiTORS: Mark Alpert,Steven Ashley, Stuart F. Brown, W. Wayt G bbs,Marguer te Holloway, Chr st e N cholson,Michelle Press, John Rennie, Michael Shermer,Sarah S mpson

    ASSOCiATE EDiTORS, ONLiNE: David Biello,Larry Greeneme erNEWS REPORTER, ONLINE: John MatsonART DiRECTOR, ONLiNE: Ryan Reid

    ART DiRECTOR: Edward BellASSISTANT ART DIRECTOR: Jen ChristiansenPHOTOGRAPHY EDITOR: Monica Bradley

    COPY DIRECTOR: Maria-Christina Keller

    EDiTORiAL ADMiNiSTRATOR: Avonelle Wing SENIOR SECRETARY: Maya Harty

    COPY AND PRODUCTION, NATURE PUBLISHINGGROUP:SENIOR COPY EDITOR, NPG: Daniel C. SchlenoffCOPY EDITOR, NPG: Michael Battaglia EDITORIAL ASSISTANT, NPG: Ann ChinMANAGING PRODUCTION EDITOR, NPG:

    R chard HuntSENIOR PRODUCTION EDITOR, NPG: Michelle Wright

    PRODUCTION MANAGER: Christina HippeliADVERTISING PRODUCTION MANAGER:Carl Chereb nPREPRESS AND QUALITY MANAGER:S lv a De Sant sCUSTOM PUBLISHING MANAGER:Madelyn Keyes-M lch

    PRESIDENT: Steven InchcoombeVICE PRESIDENT, OPERATIONS AND

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    ASTRONOMY

    Eight Wonders of the SolarSystemBy Edward Bell,illustrations by Ron Miller

    Tour some of the most breathtak ngv ews that awa t ntrep d explorers of oursolar system.

    ORiGiN OF LiFE

    Expanding the Limits of Life