What role should nuclear weapons play in today's world? How can the United States promote international security while safeguarding its own interests? "U.S. Nuclear Weapons Policy" informs this debate with an analysis of current nuclear weapons policies and strategies, including those for deterring, preventing, or preempting nuclear attack; preventing further proliferation, to nations and terrorists; modifying weapons designs; and revising the U.S. nuclear posture. Presidents Bush and Clinton made major changes in U.S. policy after the Cold War, and George W. Bush's administration made...

This volume considers the role comets may have played in the origins and evolution of life. This is the only book dealing in depth with this subject. It is particularly relevant in light of recent investigations of Halley's comet, of new insights into organic synthesis in meteorites and comets, and of new results of numerical simulations of cometary orbits and impacts on Earth. The book is intended as a comprehensive review of current research.