A man named Frank Atwood will die in Arizona on Wednesday. The state will execute him for kidnapping, raping, and killing a Tuscon girl in 1984. He maintains that he did not commit the crime but was denied clemency last month. In Arizona, inmates can choose how they want to be killed. Although Atwood is not using it, one of those options is a brutal method used by Nazis on Jews in Auschwitz during the Holocaust: hydrogen cyanide. You may know it by what the Nazis called it: Zyklon B. Although the state outlawed the gas in 1992, it can...