National Geographic

FEATURES The Science of SleepThough slumber maylook like an idle state,new science revealsthat our brains aren’tless active when wesleep—just differentlyactive. On a goodnight, we’ll cyclerepeatedly throughseveral sleep stages,each with distinctqualities and purpose.BY MICHAEL FINKELPHOTOGRAPHS BYMAGNUS WENNMAN......................................P. 4 0``````Poisoning AfricaTo stop predators thatkill livestock, Kenya’sherders put out toxicbait—and end up poi-soning the ecosystem.BY EDWIN DOBBPHOTOGRAPHS BYCHARLIE HAMILTON JAMES.......................................P. 7 8Historic WhalersRemains of a Basquegalleon shed light onwhalers’ life and work.BY FERNANDO G. BAPTISTA.....................................P. 1 0 2``````Butterfly CatchersWinged beauties endup on a black market.BY MATTHEW TEAGUEPHOTOGRAPHS BYEVGENIA ARBUGAEVA......................................P. 1 1 2DISPATCHESHealth Care CrisisYemen’s war makes itharder and costlier toget medical treatment.BY NINA STROCHLICPHOTOGRAPHS BYMATTEO BASTIANELLI.....................................P. 1 3 4AUGUST | CONTENTS