In 2013, some 200 million humans suffered from malaria, and an estimated 584,000 of them died, 90 percent in Africa. The vast majority of those killed were children under age 5. Decades of research have fallen short of a vaccine for this scourge. A powerful new technique that allows scientists to selectively edit entire genomes could provide a solution, but it also poses risks—and ethical questions science is only beginning to address. Read more about CRISPR Gives Us the Power to End Diseases and Remake Species