The papers in this collection concern Gilles Deleuze and FA(c)lix Guattari's treatment of science in "A Thousand Plateaus" and "What is Philosophy?" and address in detail the scientific issues of emergence, complexity theory, non-linear dynamics, modern mathematics and physics, and nanotechnology. These papers also explore the ways in which Deleuze and Guattari were acutely aware of post-war revolutions in physics, biology, and information technology. Recent work on Deleuze has identified the central role of the articulation between the virtual and the actual in Deleuze's "image of thought," and this volume exemplifies the importance of science in elaborating Deleuze's concept of the virtual.