BERLIN (AP) - Nazi Germany tested a crude nuclear device in March 1945, killing hundreds of people in a massive explosion south of Berlin, a German researcher claims in a new book published Monday. That the Nazis conducted nuclear experiments has been known for decades, but "Hitler's Bomb," by Berlin academic Rainer Karlsch, suggests they may have been closer to building an atomic weapon for military use than previously believed. No independent corroboration of the claims was immediately available. "German physicians did not lag behind their colleagues in the United States and Britain in their understanding of theory," Karlsch told...