What keeps national security experts up at night? For Annie Jacobsen, the answer comes in two terrifying forms: weapons that can end civilization in hours, and weapons that can spread invisibly through the air. In Biological War: A Scenario and Nuclear War: A Scenario, Jacobsen draws on deep reporting and expert interviews to show how fragile our safeguards really are—and why the most catastrophic threats are often the ones most people prefer not to think about. It’s a bracing look at deterrence, preparedness, and the thin line between worst-case scenario and real-world possibility.

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