Dr. Allan Ropper speaks with residents and fellows as they do rounds at the neuroscience intensive care unit at Brigham and Women's Hospital in Boston. M. Scott Brauer for NPR hide caption

itoggle caption M. Scott Brauer for NPR

An Indian woman takes tuberculosis pills at a clinic in Mumbai. More than 700 Indians die from TB each day. That's one death every two minutes. Pal Pillai/AFP/Getty Images hide caption

itoggle caption Pal Pillai/AFP/Getty Images

Maria Sharapova returns the ball during the semifinals of the French Open on June 5. She used platelet-rich plasma to treat a shoulder injury. Miguel Medina/AFP/Getty Images hide caption

itoggle caption Miguel Medina/AFP/Getty Images