Malaria is still the greatest killer in the world. According to a 2014 report by the World Health Organization, 90 percent of the almost 600,000 people who died from malaria in 2013 lived in Africa. Most were children. Many of their families cannot afford conventional mosquito repellants and anti-malaria drugs. That’s why Moctar Dembélé and Gérard Niyondiko have developed a soap that leaves behind a scent that repels disease-carrying mosquitoes as a low-cost solution to prevent malaria.