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
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.
The injuries Jack Blankenship sustained after a 300-pound rock pinned him to the ground while working in a coal mine prevent him from sitting for long periods of time or walking far. He says he's in constant pain.