Destroying Humanity Is Against the Law
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Explainer
Computational Statecraft: An Overview
From Emerging Technology, Scientific Advancement, and Global Policy
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What the European Drone Defense Initiative Has to Get Right
From Defense, Emerging Technology, and Strategy
A Letter from Belfer Center Director Meghan O'Sullivan
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The Iran War
Since February 2026, the U.S. and Israel have been engaged in warfare with Iran, triggering a rapidly escalating regional conflict with profound consequences for global security, energy markets, & nuclear stability. Belfer Experts comment on the latest.
Explore the Collection: The Iran War
On Enriched Uranium and (Iranian) Nuclear Bombs
From Science, Technology, and Public Policy
Interest Areas
Our research spans a variety of key issues across the globe, at the nexus of science and international affairs
Celebrating International Security at Fifty Years
Fifty years ago, the founders of International Security hoped that its creation would help revitalize the academic study of international security.
Today, International Security is one of the most widely cited journals in the field of international relations. The contents of the journal constantly evolve in response to world events, new scholarly developments, and its contributors’ particular interests, but it remains a vital resource for scholars and students alike.
Middle East & North Africa
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Reports & PapersWhither Hezbollah? A Reassessment of Identity, Crisis, and Survival on the Path to a Third Open Letter
From Intelligence Project
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Reports & Papers
10 Chinese and Pakistani Nuclear Postures and Strategies
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Reports & Papers
Egypt as a Middle Power: Short-Term Efficacy vs. Long-Term Fragility
Artificial Intelligence
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ExplainerComputational Statecraft: An Overview
From Emerging Technology, Scientific Advancement, and Global Policy
Energy
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Reports & PapersBits-to-Watts: Connecting Markets and Prices for Compute and Power
From Environment and Natural Resources
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Policy Briefs
EU Tech Sovereignty Package Policy Brief
Science & Technology
The Strategic Discipline of Imagination: Lessons from 9/11 for the Threats Ahead
Twenty-five years later, what can we learn from pre-9/11 warnings about catastrophic terrorism and institutionalizing imagination, to emerging challenges in biology, AI, and cyber?
Explore the Belfer Reading Brief on 9/11 and the Failure of Imagination
America's Achilles' Heel: Nuclear, Biological, and Chemical Terrorism and Covert Attack
From International Security Program
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JFK Jr Forum
25 Years Later: The Lessons and Legacy of September 11, 2001
Harvard Faculty, Fellows, Staff, and Students -
Reports & Papers
Countering Terrorism With "Blue Sky" Thinking