National Public Radio: The nation's capital is a pretty old city by American standards. It dates back to the late 18th century. Despite frequent face-lifts, parts of it are wearing out - for example, its underground gas pipelines. New research shows that Washington, D.C., suffers from thousands of leaks of natural gas.
"We drove 1,500 road miles in Washington, D.C., and found about 6,000 leaks," says Robert Jackson, an ecologist and environmental scientist at Duke University. "That's roughly four leaks every mile."...