Dr. Jame Abraham used positron emission tomography, or PET, scans to understand differences in brain metabolism before and after chemotherapy. Dr. Jame Abraham hide caption

itoggle caption Dr. Jame Abraham

The number of new drug shortages each year in the U.S., from 2001 through Dec. 21, 2012. University of Utah hide caption

itoggle caption University of Utah

Venezuelan Vice President Nicolas Maduro, center, addresses the nation flanked by Oil Minister Rafael Ramirez, left, and National Assembly President Diosdado Cabello at the Miraflores presidential palace in Caracas, Venezuela, on Wednesday. Efrain Gonzalez/AP hide caption

itoggle caption Efrain Gonzalez/AP

Scientists say that the best way to reduce a person's contact with the flame retardant chemicals in sofas and other furniture is to vacuum more. SINAN DONMEZ/iStockphoto.com hide caption

itoggle caption SINAN DONMEZ/iStockphoto.com

Radiation therapist Jean Etienne holds a range compensator, which shapes the depth to which the proton beam enters a patient's body to target a tumor. Rebecca Davis/NPR hide caption

itoggle caption Rebecca Davis/NPR

Dr. Joel Policzer checks on his patient, Lillian Landry, in the hospice wing of an Florida hospital in 2009. A new study found that many terminally ill cancer patients don't fully understand their prognosis. J. Pat Carter/AP hide caption

itoggle caption J. Pat Carter/AP

Maga Barzallo Sockemtickem, 16, received a bone-marrow transplant at Seattle Children's Hospital in 2011 for leukemia and returned in July 2012 for follow-up treatment. On July 25, an artist at the hospital set up a cat photo installation in her room. Courtesy of Seattle Children's Hospital hide caption

itoggle caption Courtesy of Seattle Children's Hospital

Scientists say energy-saving compact fluorescent (left) or light-emitting diode (right) light bulbs can have unsavory health effects. PRNewsFoto/OSRAM SYLVANIA hide caption

itoggle caption PRNewsFoto/OSRAM SYLVANIA

The white arrows in these two tumor samples point to a subset of tumor cells that are in a resting state. Nature hide caption

itoggle caption Nature

Timothy Ray Brown, shown in May 2011 with his dog Jack in San Francisco, is the only man ever known to have been fully cured from AIDS. Brown is known as the "Berlin patient" because he had a bone marrow transplant in a German hospital five years ago. Eric Risberg/AP hide caption

itoggle caption Eric Risberg/AP

Starting a bone marrow registry in Nigeria "became an obsession" for Seun Adebiyi. "I thought that even if I couldn't find a match, I wanted to make it easier for other black patients to find a match." Seun Adebiyi hide caption

itoggle caption Seun Adebiyi

Child life specialist Kelly Schraf helps to put at ease Yoselyn Gaitan, 8, who had surgery on her cleft palate, at Children's National Medical Center in Washington, D.C. Jenny Gold for NPR hide caption

itoggle caption Jenny Gold for NPR