Tsetse flies feast on animal blood. When they do so, humans can get Trypanosomiasis, or sleeping sickness, which starts as exhaustion and fever, and can lead to death if left untreated. In animals, the tsetse’s bite can develop into paralysis. Tsetse flies are limited to sub saharan Africa, where they infect at least 10,000 people a year. It’s a mess of an insect, but an organization in Spain thinks they have a solution, and they’re going to use drones to deliver it.