Malaria is treatable and preventable. And yet, the World Health Organization reports that almost half the world’s population — 3.2 billion people — are still at risk of contracting the life-threatening disease. At the Disrupt SF Hackathon, a group of teenage girls is gamifying malaria prevention to help halt the spread of the disease. They’re Aruna Prasad, 16, Erin Smith, 16, Kathy Kong, 17, and Lillian Yuan, 17, and they’ve built Mapsquito, a game that educates players about malaria.