About the Cover

This cross-sectional snapshot from a simulated cylindrical cell shows the temperature in turbulent Rayleigh–Bénard convection, the flow of fluid heated from below and cooled from above. Tiny plumes of rising (red) and sinking (blue) fluid are visible in the snapshot, taken close to the cylinder’s lower, warm plate. For more details on strongly turbulent convection, turn to the article by Detlef Lohse and Olga Shishkina on page 26. (Simulation courtesy of Richard Stevens and Roberto Verzicco.)