A transmission electron micrograph of the aerosol particles from a burner. Aerosols are particles of liquid or solid suspended in a gas that can affect human health and climate. Dr. Alberto Baldelli, a postdoctoral fellow, works with Dr. Steve Rogak, Department of Mechanical Engineering. He uses Hitachi H7600 TEM and FEI Tecnai TEM for Electron Tomography to characterize the morphology and formation of aerosols at different conditions.