Sam Harris speaks with William J. Perry and Lisa Perry about the ever-present threat of nuclear war. They discuss the history of nuclear weapons, the bombing of Hiroshima and Nagasaki, the Cuban Missile Crisis, the present threat of accidental nuclear war, nuclear terrorism, unilateral disarmament, the psychology of deterrence, tactical nuclear weapons, cybersecurity, details of command and control, nuclear proliferation, the steps we could take toward safety, strategic missile defense, nuclear winter, and other topics.

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