The House Homeland Security Committee heard expert testimony yesterday on the effects of a high-altitude nuclear detonation that could knock out the U.S. electrical grid for up to a year, resulting in the deaths of 90% of Americans. A nuclear attack from space would generate an electromagnetic pulse, or EMP, that would "inflict devastating damage" on the U.S. Washington Examiner: In calling on the Pentagon and President Trump to move quickly to protect the grid, the experts testified that an explosion of a high-altitude nuclear bomb delivered by a missile or satellite "could be to shut down the U.S. electric...