We commemorate the 79th anniversary of the atomic bomb dropped on Nagasaki, Japan, by revisiting a haunting question: Was the U.S. decision to destroy two Japanese cities with atomic weapons really necessary to end World War II? Author Evan Thomas discusses the motivations of key U.S. leaders, and of Japanese commanders and diplomats. His book is The Road to Surrender.

Plus, John Powers reviews The Instigators, a new action comedy starring Matt Damon and Casey Affleck.

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