Surplus and expired drugs collected during the DEA's fourth National Prescription Drug Take-Back Day. New research suggests it might be better for the environment to dispose of drugs in household trash. Keith Srakocic/AP hide caption

itoggle caption Keith Srakocic/AP

Gilead Sciences' Truvada is a step closer to being approved as a way to prevent HIV infection. Paul Sakuma/AP hide caption

itoggle caption Paul Sakuma/AP

A micrograph shows red blood cells infected by the malaria parasite Plasmodium falciparum. John C. Tan/AP hide caption

itoggle caption John C. Tan/AP

FDA Commissioner Margaret Hamburg says there is a desperate need to have the Reagan-Udall Foundation up and running. Win McNamee/Getty Images hide caption

itoggle caption Win McNamee/Getty Images