Michael A. Levi and Micah Zenko say nuclear terrorism, however unlikely, is one of the few prospects that could truly devastate the USA, and there are still steps that the U.S. can take to reduce the odds of a catastrophic attack.

Laurie Garrett discusses the mistakes and misjudgments made by government officials in response to the anthrax attacks of 2001 and provides recommendations for what should be done now.

Laurie Garrett says making a superbug that can infect thousands of people is easier than ever and examines if there is anything governments can do to prevent terrorists from learning how to make a devastating bioweapon.

Laurie Garrett discusses the public policy implications of bird flu and bioterrorism.

Laurie Garrett says man-made killer bird flu is now a reality and asks if governments can--and should--try to stop it.

The United States has made real strides against nuclear terrorism, but efforts to secure nuclear materials are incomplete and will require continued commitment, says CFR's Michael Levi.

Analysts Paul K. Kerr and Mary Beth Nikitin of the Congressional Research Service discuss the extent to which ongoing instability in Pakistan has called recent nuclear weapons-related reforms into question.

This module features teaching notes by CFR Senior Fellow Michael A. Levi, author of On Nuclear Terrorism, along with other resources to supplement the text. In this CFR book, Dr. Levi examines one of the greatest national security threats of our time: terrorist groups armed with nuclear weapons, and argues that only a broad-based and multi-layered defense can be effective in confronting it.

Listen to Michael A. Levi, CFR's fellow for science and technology and director of the program on energy security and climate change, discuss his book, On Nuclear Terrorism.

Drawing from our long experience with terrorism, Michael A. Levi proposes new principles for understanding and defending against nuclear threats.

Listen to Sam Nunn, cochairman and chief executive officer of the Nuclear Threat Initiative, reflect on the past sixty years of efforts to prevent nuclear war and discuss strategies to combat today's growing nuclear threats.

Watch Sam Nunn, cochairman and chief executive officer of the Nuclear Threat Initiative, reflect on the past sixty years of efforts to prevent nuclear war and discuss strategies to combat today's growing nuclear threats.

CFR’s Michael A. Levi and Harvard’s Graham T. Allison consider the likelihood of catastrophic nuclear terrorism in the United States.

Michael Levi speaks with cfr.org's Eben Kaplan about the consequences of nuclear terrorism on U.S. soil.

Nuclear terrorism and its prevention preoccupy the U.S. military, intelligence community, and diplomatic corps. But experts say the country should be doing more to lessen chances of an attack.