Electromagnetic pulses, which are oversized outbursts of atmospheric electricity, have become political fodder, drawing warnings from former House speaker Newt Gingrich and spurring a House of Representatives “Grid Act” bill that now awaits Senate action. Whether powered by geomagnetic storms or by nuclear blasts, their resultant intense magnetic fields can induce ground currents strong enough to burn out power lines and electrical equipment across state lines.Read more at PhyOrg.com