The Danube River, the second longest in Europe, is running so low that dozens of Nazi battleships are emerging from the riverbed.The river runs through Germany, Austria, Slovakia, Hungary, Croatia, Serbia, Romania, Bulgaria, Moldova, and UkraineWater has dropped so low because of drought and brutal heatwaves that the hulks of dozens of World War II German battleships are emerging into view, distracting from the summer heat crisis. The Danube’s record low water levels also have forced power plants to the brink of shutting down, and governments across Central and Eastern Europe are taking steps to conserve electricity.In the middle of...