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Loud, concussive explosions on the battlefield may last only a few seconds, but many soldiers returning from combat in the Middle East are experiencing lingering symptoms that cause them to perceive sounds even when it is quiet.

Roadside bombs are often responsible for what's been called the "signature wound" for troops on the battlefield: brain injuries. Clarissa Ward visited the Concussion Care Center at Forward Operating Base Fenti in Afghanistan, where specialists there are taking a new approach to helping the wounded

Medieval armor certainly looks heavy. And now researchers have demonstrated how the protection might have unwittingly put its wearers at a heavy disadvantage on the battlefield. An armored combatant in the 1400s had between about 60-to-110-pounds of steel on his head and body

01 / SolarCity > > For being the nation's leading installer of rooftop solar panels. In sum, SolarCity has placed more than 10,000 solar rooftops--10% of the total in the U.S.