EARLIER, THIS ON HOW SABOTAGE STOPPED HITLER’S BOMB. Now this: Birger Stromsheim, Hero on Skis in an Anti-Nazi Raid, Dies at 101. “They had skis and explosives and a destination: the German-controlled Norsk Hydro facility, high on an isolated and snowy ridge. The Norwegians intended to destroy equipment inside that the Germans were using to produce what is known as heavy water, a crucial ingredient in making a nuclear weapon and one they feared the Nazis would use to build an atomic bomb. . . . Mr. Stromsheim was 31 at the time of the assault, the oldest member of the mission. He was particularly respected for his expertise in explosives and for his calm.”