A 2008 view of the leading edge of the Larsen B ice shelf, extending into the northwest part of the Weddell Sea. Huge, floating ice shelves that line the Antarctic coast help hold back sheets of ice that cover land. Mariano Caravaca /Reuters/Landov hide caption

itoggle caption Mariano Caravaca /Reuters/Landov

A simulation from the Neitz lab of what colorblindness looks like, with normal color vision on the left and red-green colorblindness on the right. Courtesy of Neitz Laboratory hide caption

itoggle caption Courtesy of Neitz Laboratory

Safe and small: The credit-card-sized test for anthrax destroys the deadly bacteria after the test completes. Courtesy of Sandia Nation hide caption

itoggle caption Courtesy of Sandia Nation

When combined with results of other neurological tests, and in the context of a thorough medical history, atrophy of the brain (shown here in an MRI scan) sometimes indicates Alzheimer's. Simon Fraser/Science Source hide caption

itoggle caption Simon Fraser/Science Source

Both James Eversull (left) and Pat Patchell were treated with experimental chemotherapy and radiation for leukemia as children in the 1960s. Together, they're now some of the country's oldest leukemia survivors.. Courtesy of James Eversull; Courtesy of Pat Patchell hide caption

itoggle caption Courtesy of James Eversull; Courtesy of Pat Patchell

Johnny Reynolds ignored diabetes symptoms and put off going to the doctor for years when he didn't have health insurance. He was afraid he couldn't afford treatment. Anders Kelto/NPR hide caption

itoggle caption Anders Kelto/NPR

The European Union banned the use of antibiotics to boost animals' growth in 2006. At first, the ban had little effect on the amount of drugs given to pigs. Carsten Rehder/Corbis hide caption

itoggle caption Carsten Rehder/Corbis

Grey lines connecting health care workers (marked with "+") and patients represent contacts between them. The red figures are carriers of MRSA. Obadia et al./PLOS Computational Biology hide caption

itoggle caption Obadia et al./PLOS Computational Biology

Staghorn coral planted by scientists in the Florida Keys. Researchers hope to give the same sort of boost to the world's shrinking population of pillar coral, now that they can raise the creatures in a laboratory. Joe Berg/Way Down Video/Mote hide caption

itoggle caption Joe Berg/Way Down Video/Mote

A nurse in 1938 checks the amount of insulin in a needle. For many decades, the only insulin available to people with diabetes came from the pancreases of cattle or pigs. Insulin from animals is still available outside the U.S. — and cheaper than a recombinant DNA version. Bettmann/Corbis hide caption

itoggle caption Bettmann/Corbis

The effects of malaria in the brain are clear: A healthy brain, right, has many grooves and crevices. But when the brain swells up, left, these crevices smooth out. Courtesy of Michigan State University hide caption

itoggle caption Courtesy of Michigan State University

Celebrity chef Giada De Laurentiis during a guest appearance on ABC's The Chew last fall. She can cook rich foods and keep her trim figure, but new research suggests that's a difficult feat for amateur cooks watching along at home. Lou Rocco/ABC/Getty Images hide caption

itoggle caption Lou Rocco/ABC/Getty Images

Brazilian mothers participate in a demonstration in 2011 for the right to breastfeed in public, in Sao Paulo, Brazil. Eduardo Anizelli/STF/LatinContent/Getty Images hide caption

itoggle caption Eduardo Anizelli/STF/LatinContent/Getty Images