恶第四季

介绍：　　1. Boko Haram Unnatural Selection: The Nigerian government is determined to drive militants from a terrorist group out of the country A new gene-editing method allow scientists to change the genetic traits of plants and animals.　　2. Escape to Europe Cycle of Terror: Following the refugee trail from the Syrian border to Europe The global reaction to the terrorist attack in Paris impacts the fight against terrorism.　　3. Right to Die: Exploring the moral, political and personal questions raised