In recent years, malaria has emerged as a cause cÃlèbre for voguish philanthropists. Bill Gates, Bono, and Laura Bush are only a few of the personalities who have lent their names—and opened their pocketbooks—in hopes of curing the disease. Still, in a time when every emergent disease inspires waves of panic, why arenâ€t we doing more to eradicate one of our oldest foes? And how does a parasitic disease that weâ€ve known how to prevent for more than a century still infect 500 million people...