恶第四季

　　1.BokoHaram&UnnaturalSelection:TheNigeriangovernmentisdeterminedtodrivemilitantsfromaterroristgroupoutofthecountry;Anewgene-editingmethodallowscientiststochangethegenetictraitsofplantsandanimalsddd　　2.EscapetoEurope;CycleofTerror:FollowingtherefugeetrailfromtheSyrianbordertoEurope;TheglobalreactiontotheterroristattackinParisimpactsthefightagainstterrorism.　　3.RighttoDie:Exploringthemoral,politicalandpersonalquestionsraisedbyeuthanasia.　　4.BeatingBlindness&WhiteCollarWeed:Doctorsandresearchersmakeincrediblestridesinthefightagainstblindness;Strugglingsmall-scalemarijuanafarmersfacecorporatetakeoversastheendofthepot-prohibitionnears　　5.Meathooked&EndofWater:Examiningtheenvironmentalharmofindustrialmeatoperations;Assessingthedepthsoftheworld'swatercrisis.　　6.ReturntoYemen&ChurchandStates:ExaminingtheconflictinYemen;ExploringtheongoingbattleforLGBTequalrightsintheUnitedStates.　　7.PalestineNowandVivaCubaLibre:ExploringthelivesofyoungPalestinianstoday;ExaminingthepoliticalthawingofrelationshipsbetweenCubaandtheUnitedStates.　　8.AfghanWomen'sRights&FloatingArmories:ViolenceandoppressionarestillafactoflifeforwomeninAfghanistan;Privatemilitarycontractorsprotectglobalcommerce.　　9.TheFutureofEnergy:Examiningthefutureofhowtomakeanduseenergyandhowtomeetthegrowingdemandascarbonemissionsarecut.　　10.TrumpinDubai&ChinainAfrica:TheplightofmigrantworkersinDubai;ExaminingtheincreasinglyprominentbusinessrelationshipbetweenChinaandAfrica.　　11.TheDeal&CityofLostChildren:ExploringtherecentIrandealfrombothsides;TribesofhomelesschildrenlivealongthetracksinKolkata,India.　　12.TheEndofPolioandCollateralDamage:HealthworkersputtheirlivesonthelineinPakistantoeradicatepolio;ExaminingthedevastatingeffectsofunexplodedordnanceinMyanmarandLaos.　　13.StateofSurveillance:ShanetravelstoMoscowtomeetwithEdwardSnowdenanddiscussgovernmentsurveillanceprograms.　　14.HeroinCrisis&NewAgeofNukes:TheeffectsofAmerica'sHeroinepidemicandthenextnucleararmsrace.　　15.FlintWaterCrisis&LibyaontheBrink:ExaminingtheeffectsofthewatercrisisinFlint,Mich.;InLibya,rivalmilitiasfighttosavethecountry.　　16.DieTrying:PatientsandtopresearchersacrosstheU.S.discussrecentmeasurestakentotackleALS;ExploringtheregulatoryhurdlesfacedbyALSpatientsanddrugmakers.　　17.StudentDebt&FecalMedicine:Thecorrelationbetweenstudent-loanborrowingandthesoaringcostofcollegetuition;Amedicalrevolutioninvolvesusingstoolfromahealthypersontotreatsevereintestinalinfectionsinothers.　　18.TheNew$paceRace&ClosingGitmo:NASAandagrowingcommunityofprivatecompaniesdecidetoprepareforMarsexploration;Ex-detaineesrevealwhatreallyhappensbehindthewallsoftheAmericanprisonatGuantanamoBay,Cuba.