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cover: Computational modeling connects dynamics on a hierarchy of length and time scales. In this computational fluid dynamics simulation, artist and scientist–programmer Mark J. Stock turns initially banded colors into intricate system-scale flows by simply and repeatedly exchanging the properties of individual adjacent pixels. To read about how physics-based multiscale models capture the unique and counterintuitive behaviors of polymeric liquids and solids, see the article by Jay Schieber and Markus Hütter on page 36. (Detail from CF126_480, 2020, courtesy of Mark J. Stock.)