Discover 2018-05.pdf

DiscoverSCIENCE FOR THE CURIOUSA Safer OPIOID?Africas Great RiftLife Blooms After WarSee a Trillion GalaxiesPLUSThe Fat-Reduction FormulaNew Research in Male Birth ControlThe Hunt for an Addiction-Free DrugP.42P.36P.30P.50P.70P.60P.26RACE TO FIND LOST SPECIESMAY 2018BONUS ONLINE CONTENT CODE p.3Explore the Canadian Maritimes with Caravan;Call Now for Choice Dates;FREE Brochure:1-800-CARAVAN,CNova Scotia&P.E.I.10-Day Tour$1495Fully Guided Tour of the Canadian Maritimes:Nova Scotia,New Brunswick,and Prince Edward IslandCabot Trail,Cape BretonThe Best Value In Fully Guided Tours Since 1952FREE Brochure:1-800-CARAVAN,CLouisbourgLighthousePrince Edward IslandPeggys CoveHalifax WaterfrontYour Nova Scotia tour is fully guided,and includes all activities with a great itinerary.With Caravan,you explore all three of Canadas Maritime Provinces:Nova Scotia,New Brunswick,and P.E.I.Visit Flowerpot Rocks and the Bay of Fundy Tides,Cabot Trail,Fortress of Louisbourg,and more!Detailed itinerary at C.Call now for choice dates.“Brilliant,Affordable Pricing”Arthur Frommer,Travel Editor“What an amazing vacation of the Canadian Maritimes”Caravan Client,NJDiscover for yourself why smart shoppers and experienced travelers have chosen Caravan since 1952.Choose Your Guided Tour+tax,feesGuatemala w/Tikal 10 days$1395Costa Rica 9 days$1295Panama Canal Tour 8 days$1295Nova Scotia,P.E.I.10 days$1495Canadian Rockies 9 days$1795Grand Canyon,Zion 8 days$1495California Coast 8 days$1595Mount Rushmore 8 days$1395New England 8 days$1395Peggys CoveFishing Village and LighthouseBay of FundyHighestTidesOn EarthHopewell CapeFlowerpot RocksAnne of Green GablesCabot TrailMountains Meet OceanAtlantic OceanFortress of LouisbourgHalifaxChticampFrenchAcadianVillageNOVA SCOTIANEW BRUNSWICKPRINCE EDWARDISLANDCAPE BRETON ISLANDBaddeckAlexander Graham BellSailing CruiseBras dOr LakesDaystopOvernightTwo NightsMay 2018 DISCOVER 3 Contents MAY 2018 VOL.39,NO.430 Beyond the CondomWhy cant scientists create a safe,reliable birth control for men?BY NATHANIEL SCHARPING 36 One Big Fat TruthA lot of research has gone into why people are overweight.Perhaps its simple:More calories in than calories out equals weight gain.BY TAMAR HASPEL42 Building a Better PainkillerOpioids are effective at treating chronic pain,but theyre also addictive and sometimes deadly.In the midst of an opioid epidemic,researchers are on the hunt for safer painkillers.BY JONATHON KEATSLORRAINE FIELDFEATURES50 Africas Big BreakEarths continents once constituted a single landmass called Pangaea before geological forces ripped it apart.Another continental tear the irst one we can study in real time could be underway.BY SHANNON HALLSPECIAL HEALTH SECTIONIn 2005,a massive gash opened up in Ethiopia,adding to a debate among geologists about a continental split.Read more on page 50.Website access code:DSD1805 Enter this code at:www.DiscoverM to gain access to exclusive subscriber content.ContentsDiscoverSCIENCE FOR THE CURIOUSA Safer OPIOID?Africas Great RiftLife Blooms After WarSee a Trillion GalaxiesPLUSThe Fat-Reduction FormulaNew Research in Male Birth ControlThe Hunt for an Addiction-Free DrugP.42P.36P.30P.50P.70P.60P.26RACE TO FIND LOST SPECIESMAY 20184 DISCOVERMAGAZINE.COMCOLUMNS&DEPARTMENTS6 EDITORS NOTEhe Root of It AllMedical researchers take on some basics of life:pain,food and sex.7 INBOXReaders weigh in on marijuana farms and witnessing totality.22 VITAL SIGNSBy Its CoverA fathers frenzied behavior appears to be drug-related,but his blood tells a different story.BY JULIA MICHIE BRUCKNER26 NOTES FROM EARTHhe Animal CollectiveA researcher travels the world collecting undiscovered species before its too late.BY MICHAEL STONE9 THE CRUXDrug marketing wields plenty of influence on doctors prescriptions;jockeys,horses and science are a big part of the Kentucky Derby;and more.70 HISTORY LESSONSLife After WarThe remnants of a World War I battle that decimated a landscape are now habitats for lora and fauna.BY KATHERINE KORNEI74 20 THINGS YOU DIDNT KNOW ABOUT Big CatsThe tiger is the biggest cat,black panthers are not a species and the real reason two lions became the Man-Eaters of Tsavo.BY ELISA R.NECKARTOP:LAURENT CHARLES/OUR PLANET REVIEWEDMNHN-PNI-IRD PAPUA NIUGINI EXPEDITION.BOTTOM:LIFE ON WHITE/ALAMY STOCK PHOTOSON THE COVERRace to Find Lost Species p.26A Safer Opioid?:The Hunt for an Addiction-Free Drug p.42The Fat-Reduction Formula p.36New Research in Male Birth Control p.30Africas Great Rift p.50Life Blooms After War p.70See a Trillion Galaxies p.60COVER:Jiri Hera/Shutterstock59 OUT THERE:SPECIAL BONUS SECTIONThe estimated number of galaxies has jumped from billions to trillions,thanks to improved tech;and in 1930,a captivated nation thought up names for a new world,known only as Planet X.Mollusks from Papua New Guinea are among the rare species collected by a globe-trotting scientist.Read more on page 26.In the early 1930s watch manufacturers took a cluefrom Henry Fords favorite quote co