Book excerpt: Command of the commons : the military foundation of U.S. Hegemony / Barry R. Posen / - Why do states build nuclear weapons? Three models in search of a bomb / Scott D. Sagan / - Never say never again : nuclear reversal revisited / Ariel E. Levite / - Preventing nuclear entrepreneurship in russia's nuclear cities / Sharon K. Weiner / - Pathogens as weapons : the international security implications of biological warfare / Gregory Koblentz / - Dreaded risks and the control of biological weapons / Jessica Stern / - Beyond the MTCR : building a comprehensive regime to contain ballistic missile proliferation / Dinshaw Mistry / - Human security : paradigm shift or hot air? / Roland Paris / - Security, stability, and international migration / Myron Weiner / - HIV / AIDS and the changing landscape of war in Africa / Stefan Elbe / - Collateral damage : humanitarian assistance as a cause of conflict / Sarah Kenyon Lischer / - Market civilization and its clash with terror / Michael Mouusseau / - T ...