Postprint version. Published in Bulletin of the Atomic Scientists, Volume 61, Issue 3, May 1, 2005, pages 23-25. Copyright © 2005 Sage Publications. The definitive version is available at http://dx.doi.org/10.2968/061003008 .
As more countries acquire the scientific knowledge to build nuclear weapons, the U.S. response should not be heightened secrecy but a renewed commitment to strengthening political safeguards.