Unifi makes Repreve, a thread that comes from plastic waste bottles and leftover polyester scraps, at its Yadkinville, N.C., facility. Courtesy of Unifi hide caption

toggle caption Courtesy of Unifi

Workplace drug testing for marijuana may need updating in light of changing laws, a case before the Colorado Supreme Court suggests. Kai-Huei Yau/MCT/Landov hide caption

toggle caption Kai-Huei Yau/MCT/Landov

Tobacco giant Reynolds American is buying Lorillard and acquiring Newport, a popular menthol cigarette. In a shrinking market, Newport is one of the few U.S. brands gaining market share. It is particularly popular among African-American smokers. Justin Sullivan/Getty Images hide caption

toggle caption Justin Sullivan/Getty Images

We can all work up a stinky sweat — welders, ballerinas and number-crunchers alike. Would you want to know? emreogan/iStockphoto hide caption

toggle caption emreogan/iStockphoto

A team-building exercise involving marshmallows and knives is led by Create-Learning. This is relatively tame compared with some co-worker bonding activities. Clark Dever/Courtesy of Create-Learning hide caption

toggle caption Clark Dever/Courtesy of Create-Learning

Helping employees take the time to go for a walk instead of reaching for junk food when energy flags boosts productivity, some firms find. Jamie Grill Photography/Tetra Images/Corbis hide caption

toggle caption Jamie Grill Photography/Tetra Images/Corbis

For homes near the Hague River in downtown Norfolk, flooding is now a regular event. On a calm day, at high tide, the water laps just inches from the top of the barrier. Yuki Noguchi/NPR hide caption

toggle caption Yuki Noguchi/NPR

A coal-fired power plant in Colstrip, Mont. The Environmental Protection Agency wants U.S. power plants to cut carbon pollution by 30 percent. Matt Brown/AP hide caption

toggle caption Matt Brown/AP

NPR thanks our sponsors

Become an NPR sponsor