In this talk we will present some of my research done at Alias Systems in real-time simulations of physical phenomena. In particular; we will describe a stable solution of fluid flow. But real-time cloth; hair; caustics and diffraction effects will also be covered. We will then show how these fast simulations can be used to control physical systems to achieve particular effects. For example; we will describe my recent work with Treuille et al from the University of Washington in controlling smoke animations using key frames.