CoverImages on the cover represent a broad range of natural systems that drive the science supported by the Office of Biological and Environmental Research within the U.S. Department of Energy Office of Science. These systems are not only structurally and spatially complex with many different interacting parts spanning molecular to global scales, but they also are dynamically complex, encompassing processes that occur over time scales ranging from nanoseconds to centuries.Image credits: Ball-and-stick representation of atoms within a molecule from Pacific Northwest National Laboratory. Ribosome molecular complex image from Ditlev Brodersen, Aarhus University. Microscopic image of fungal hyphae on a root surface, copyright Merton Brown, Visuals Unlimited. Forest ecosystem image from the U.S. National Park Service. Mountain and Earth images from iStockphoto. Cover developed at Oak Ridge National Laboratory.

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