Christian Science Monitor: Across much of the United States, regional droughts and heatwaves are appearing simultaneously more frequently, imposing more-extreme conditions than either would deliver separately, according to a new study. California's four-year drought is a case in point, says Amir AghaKouchak, a civil engineer at the University of California at Irvine and the new study's senior author. Looking only at 2014 and using precipitation as the indicator, "it is a serious drought, but it is not that extreme," he says....