US looks for answers after hypersonic plane fails

Pentagon scientists on Friday acknowledged they were puzzled by the failed flight test of an experimental hypersonic plane and said they were trying to understand what went wrong.

Study determines best arrangement of tidal sails device

In the long sprint to find new sources of clean, low-cost power, slow and steady might win the race—the slow-moving water of currents and tides, that is. Just as wind turbines tap into the energy of flowing air to generate ...

US to launch anew secretive space plane

The United States is planning a new launch of its tiny, pilotless military space plane on Tuesday as part of a futuristic Air Force program that has fueled speculation over its mission.

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