Overview of Atomistic Mechanics; Formulating Atomistic Simulations; Thermodynamics, Statistical Mechanics, and Temperature; Continuum Mechanics: Continuity, Stress, Heat Flux, Applications; Numerical Molecular Dynamics and Chaos; Time-Reversible Atomistic Thermostats; Key Results from Nonequilibrium Simulations; Second Law, Reversibility, Instability; Outlook for Progress and Life on Earth;