Malaria is caused by bites from parasite-infected mosquitos. 2021 saw 247 million new infections and 620,000 deaths. But a new firm hopes to wipe out the disease through drones. They spot stagnant water where young mosquitoes live, then calculate the best place to set up pesticides. Keeping costs low in Sierra Leone means polystyrene drone bodies and consumer cameras that are easy to repair. The firm hopes to expand to other countries and diseases. Meet the young innovators tackling malaria.