1、THE SCIENCE OF SLEEP“We are now living in a worldwide test of the negative consequences of sleep deprivation.”ROBERT STICKGOLD,HARVARD MEDICAL SCHOOL N AT I O N A L G E O G R A P H I CP R O O FE M B A R KE X P L O R EC O N T E N T SAU G U ST 2 0 1 836ALSO Ancient Bloodsuckers Chilling Out on Mars Mi
2、grations ArtifactsTHROUGH THE LENSAn Images ImpactThey shared a photo to warn of climate threats to wildlife but the mes-sage got sidetracked.BY CRISTINA MITTERMEIERATLASCoral Reef LossRising sea surface tem-peratures cause coral bleaching and death at landmarks like the Great Barrier Reef.BY LAUREN
3、 E.JAMESALSO Out of Eden Walk:Update Descent Into a Volcano With Sulfur MinersEndangered BirdsWhen one-of-a-kind species are on the verge of extinction,what persuades people to save them?Maybe the right images.BY JONATHAN BAILLIEPHOTOGRAPHS BY TIM FLACH817On the CoverWile Wennman,seven,of Nacka,Swed
4、en,likes to fall asleep with the light on,says his father,Magnusa pho-tographer whos traveled the world to capture how and where people sleep.MAGNUS WENNMANTHE BIG IDEAAre We as Awful as We Act Online?Its not human nature that sparks mean posts and tweets.But evolu-tion does play a role.BY AGUSTN FU
5、ENTESDATA SHEETEarth-Friendly TransitTransportation systems help cities stem pollu-tion,increase livability.BY RYAN MORRIS AND KELSEY NOWAKOWSKIF E A T U R E SThe Science of SleepThough slumber may look like an idle state,new science reveals that our brains arent less active when we sleepjust differ
6、ently active.On a good night,well cycle repeatedly through several sleep stages,each with distinct qualities and purpose.BY MICHAEL FINKELPHOTOGRAPHS BY MAGNUS WENNMAN.P.40Poisoning AfricaTo stop predators that kill livestock,Kenyas herders put out toxic baitand end up poi-soning the ecosystem.BY ED
7、WIN DOBB PHOTOGRAPHS BY CHARLIE HAMILTON JAMES.P.78Historic WhalersRemains of a Basque galleon shed light on whalers life and work.BY FERNANDO G.BAPTISTA.P.102Butterfly CatchersWinged beauties end up on a black market.BY MATTHEW TEAGUEPHOTOGRAPHS BY EVGENIA ARBUGAEVA.P.112DISPATCHESHealth Care Crisi
8、s Yemens war makes it harder and costlier to get medical treatment.BY NINA STROCHLICPHOTOGRAPHS BY MATTEO BASTIANELLI.P.134A U G U S T|C O N T E N T SA U G U S T|W H A T S C O M I N GNATIONAL GEOGRAPHIC(ISSN 0027-9358)PUBLISHED MONTHLY BY NATIONAL GEOGRAPHIC PARTNERS,LLC,1145 17TH ST.NW,WASHINGTON,D
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14、t DMAchoice.org,or mail a request to:DMA Choice,c/o Data&Marketing Association,PO Box 643,Carmel,NY 10512.Contributions to the National Geographic Society are tax de-ductible under Section 501(c)(3)of the U.S.tax code.|Copyright 2018 National Geographic Partners,LLC|All rights reserved.National Geog
15、raphic and Yellow Border:Registered Trademarks Marcas Registradas.National Geographic assumes no respon-sibility for unsolicited materials.Printed in U.S.A.PHOTO:RONAN DONOVANNAT GEO TVObserve Wildlife in Real Time on Yellowstone LiveWithin the 22.6 million acres of the Greater Yellow-stone Ecosyste
16、m,there are lush forests,dramatic canyons,gushing geysersand more than 300 animal species.For the four-night television event Yellow-stone Live,world-renowned cinematographers will use cutting-edge technology to show some of Earths most majestic wildlife in real time.Episodes will air August 5 to 8 at 9/8c on National Geographic.BOOKSBirds of the Photo Ark Take FlightOf the many species that Joel Sartore has photographed,some of the most glorious are birds.Their images fill the 240 pages of Bird