恶第四季

　　1.BokoHaramUnnaturalSelection:TheNigeriangovernmentisdeterminedtodrivemilitantsfromaterroristgroupoutofthecountryAnewgene-editingmethodallowscientiststochangethegenetictraitsofplantsandanimalsccc　　2.EscapetoEuropeCycleofTerror:FollowingtherefugeetrailfromtheSyrianbordertoEuropeTheglobalreactiontotheterroristattackinParisimpactsthefightagainstterrorism.　　3.RighttoDie:Exploringthemoral,politicalandpersonalquestionsraisedbyeuthanasia.　　4.BeatingBlindnessWhiteCollarWeed:DoctorsandresearchersmakeincrediblestridesinthefightagainstblindnessStrugglingsmall-scalemarijuanafarmersfacecorporatetakeoversastheendofthepot-prohibitionnears　　5.MeathookedEndofWater:ExaminingtheenvironmentalharmofindustrialmeatoperationsAssessingthedepthsoftheworld'swatercrisis.　　6.ReturntoYemenChurchandStates:ExaminingtheconflictinYemenExploringtheongoingbattleforLGBTequalrightsintheUnitedStates.　　7.PalestineNowandVivaCubaLibre:ExploringthelivesofyoungPalestinianstodayExaminingthepoliticalthawingofrelationshipsbetweenCubaandtheUnitedStates.　　8.AfghanWomen'sRightsFloatingArmories:ViolenceandoppressionarestillafactoflifeforwomeninAfghanistanPrivatemilitarycontractorsprotectglobalcommerce.　　9.TheFutureofEnergy:Examiningthefutureofhowtomakeanduseenergyandhowtomeetthegrowingdemandascarbonemissionsarecut.　　10.TrumpinDubaiChinainAfrica:TheplightofmigrantworkersinDubaiExaminingtheincreasinglyprominentbusinessrelationshipbetweenChinaandAfrica.　　11.TheDealCityofLostChildren:ExploringtherecentIrandealfrombothsidesTribesofhomelesschildrenlivealongthetracksinKolkata,India.　　12.TheEndofPolioandCollateralDamage:HealthworkersputtheirlivesonthelineinPakistantoeradicatepolioExaminingthedevastatingeffectsofunexplodedordnanceinMyanmarandLaos.　　13.StateofSurveillance:ShanetravelstoMoscowtomeetwithEdwardSnowdenanddiscussgovernmentsurveillanceprograms.　　14.HeroinCrisisNewAgeofNukes:TheeffectsofAmerica'sHeroinepidemicandthenextnucleararmsrace.　　15.FlintWaterCrisisLibyaontheBrink:ExaminingtheeffectsofthewatercrisisinFlint,Mich.InLibya,rivalmilitiasfighttosavethecountry.　　16.DieTrying:PatientsandtopresearchersacrosstheU.S.discussrecentmeasurestakentotackleALSExploringtheregulatoryhurdlesfacedbyALSpatientsanddrugmakers.　　17.StudentDebtFecalMedicine:Thecorrelationbetweenstudent-loanborrowingandthesoaringcostofcollegetuitionAmedicalrevolutioninvolvesusingstoolfromahealthypersontotreatsevereintestinalinfectionsinothers.　　18.TheNew$paceRaceClosingGitmo:NASAandagrowingcommunityofprivatecompaniesdecidetoprepareforMarsexplorationEx-detaineesrevealwhatreallyhappensbehindthewallsoftheAmericanprisonatGuantanamoBay,Cuba.