Science

A baby born with microcephaly in Brazil is examined by a neurologist. Felipe Dana/AP hide caption

A Madison Water Utility Crew works to dig up and replace a broken water shutoff box in preparation for a larger pipe-lining project. Madison started using copper instead of lead pipes in the late 1920s. Cheryl Corley/NPR hide caption

Dr. Dorry Segev (right), of Johns Hopkins Medicine, led the team of doctors that transplanted an HIV-positive liver and kidney into two different HIV-positive patients this month. Johns Hopkins Medicine hide caption

Fatty plaque (shown here in yellow) blocks about 60 percent of this coronary artery's width. The increasing thickness of artery walls is just one factor that can increase vulnerability to a heart attack or stroke. Prof. P.M. Motta/G. Macchiarelli, S.A. Nottola/Science Source hide caption

An oil field truck is used to make a transfer at oil-storage tanks in Williston, N.D., in 2014. It was atop tanks like these that oil worker Dustin Bergsing, 21, was found dead. Eric Gay/AP hide caption

The modern broiler, or meat chicken, grows incredibly fast. But some critics say the bird — and the flavor of its meat — may suffer as a result. Whole Foods wants all of its suppliers to shift to slower-growing chicken breeds, like this one, seen at Arkansas-based Crystal Lake Farms. Courtesy of Crystal Lake Farms hide caption

Paul Hornback was a senior engineer and analyst for the U.S. Army when he was diagnosed with Alzheimer's disease six years ago at age 55. His wife, Sarah, had to retire 18 months ago to care for him full time. Courtesy of the Hornbeck family hide caption

Large cracks in the sidewalk in Coyle, Okla., appeared after several earthquakes on Jan. 24. J Pat Carter/Getty Images hide caption