Cover image: An internodal cell of Chara corallina, a freshwater alga, viewed from below on a horizontal microscope stage. Various internal structures in the 1-mm diameter cell have settled under gravity and gathered near the indifferent zone through the shearing action of cytoplasmic streaming. In their article on pages 3663–3667, Goldstein et al. explore the role of cytoplasmic streaming in mixing the cellular contents. Image courtesy of Raymond E. Goldstein, Idan Tuval, and Jan-Willem van de Meent.