Blood delivered by drone

In a warehouse outside of Kigali Rwanda, 15 drones sit waiting to receive a message. When the text comes in, one loads up and zips off into the sky--on a mission to save a life. Last week, the government of Rwanda announced an emergency drone delivery service. These drones will make up to 150 trips per day, carrying blood supplies to clinics in need. Rwanda has relatively good infrastructure in some places, but in others it can be unreliable, says Moz Siddiqui at the Global Alliance for Vaccines and Immunization, one of three partners in the project, along with UPS and drone company Zipline