A long hundreds of miles of Lake Victoria's shoreline in Kenya, a squadron of young scientists and an army of volunteers are waging an all-out war on a creature that threatens the health of more people than any other on Earth: the mosquito. They're testing new insecticides and ingenious new ways to deliver them. They're peering into windows at night, watching for mosquitoes on sleeping people. They're collecting blood-from babies, from moto-taxi drivers, from goatherds and their goats—to track the parasites the mosquitoes carry. But Eric Ochomo, the entomologist leading this effort on the front lines of global public health, stood in the swampy grass, laptop in hand, and acknowledged a grim reality. "It seems," he says, "as though the mosquitoes are winning." Less than a decade ago, we humans appeared to have gained the clear edge in the long fight against the mosquito. But over the past few years, that progress has reversed. The insecticides, used since the 1970s to spray in houses and on bed nets to protect sleeping children, have become far less effective. After declining to a historic low in 2015, cases of malaria—a mosquito-borne disease are rising. So are malaria deaths. Climate change has brought mosquitoes carrying viruses that cause dengue and chikungunya, excruciating and sometimes deadly fevers, to places where they've never been before. Once a purely tropical disease, dengue is now being transmitted in Florida and France. This past summer, the U.S. saw its first locally transmitted cases of malaria in 20 years, with nine cases reported, in Texas, Florida, and Maryland. "The situation has become challenging in new ways in places that have historically had these mosquitoes," says Ochomo, "and also, at the same. Who is involved? Describe their cultural identities.