Growing demand for more fuel-efficient cars and trucks, like these 2009 Dodge Journey crossover vehicles, has helped drive down gasoline consumption in the U.S.
David Zalubowski/AP
hide caption
International airline travelers wait for their luggage at Dulles International Airport near Washington, D.C.
Paul J. Richards/AFP/Getty Images
hide caption
The Homeland Security Department's Control System Security Program facilities in Idaho Falls, Idaho, are intended to protect the nation's power grid, water and communications systems. U.S. security officials and members of Congress are convinced a new law may be needed to promote improved cyberdefenses at critical facilities.
Mark J. Terrill/AP
hide caption
