Visitors walk through the Hachette Book Group's exhibition in May at BookExpo America, the annual industry convention in New York. Mark Lennihan/AP hide caption
Premature infants in a neonatal intensive care unit may be exposed to DEHP, a chemical in some PVC medical equipment. ERproductions Ltd/Blend Images/Corbis hide caption
Defense Secretary Chuck Hagel testifies on Capitol Hill in Washington on Thursday. Evan Vucci/AP hide caption
Sen. Mary Landrieu, D-La., chair of the Senate energy committee, spoke Wednesday about getting congressional approval for the Canada-to-Texas Keystone XL pipeline. With her is Sen. Joe Manchin, D-W.Va., a member of the committee. J. Scott Applewhite/AP hide caption
NATO has reported a spike in Russian military activity at sea and in NATO and other western European countries' airspace as tensions have mounted over Ukraine. Here, a Russian military long-range bomber aircraft flies in international airspace on Oct. 29. Royal Air Force/AP hide caption
Democratic U.S. Sen. Mary Landrieu of Louisiana walks through the U.S. Capitol on Wednesday. Congress returned to work following last week's midterm elections break. Landrieu is locked in a runoff with Republican Rep. Bill Cassidy. Mark Wilson/Getty Images hide caption
Fort Logan National Cemetery in Sheridan, Colo., gets a fresh dusting of snow on Veterans Day. David Zalubowski/AP hide caption
Beacon Power President and CEO Barry Brits, at the company's plant in Hazle Township, Pa. He says a loan from the Department of Energy made it possible for his company to develop its flywheel energy storage technology. Jeff Brady/NPR hide caption
Few police departments have required officers to wear body cameras, but that's changing after the events in Ferguson, Mo., this summer. Jim Mone/AP hide caption
Workers assemble Volkswagen Passat sedans at the German automaker's plant in Chattanooga, Tenn., on June 12, 2013. The automaker announced a new policy Wednesday that would allow interaction with labor unions at the plant. Erik Schelzig/AP hide caption
U.S. Treasury Secretary Jack Lew says the global economy is relying too heavily on just the United States for growth. Chip Somodevilla/Getty Images hide caption
State Reps. Barry Moore, Joe Hubbard, Rod Scott and Merika Coleman study a map of the proposed redistricting plan in May 2012 following a meeting of the Legislative Committee on Reapportionment at the Alabama Statehouse in Montgomery, Ala. Dave Martin/AP hide caption