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<jats:title>Shake, rattle, and help each other along</jats:title> <jats:p> In classical statistical mechanics, the deterministic dynamics of a many-body system are replaced by a probabilistic description. Chvykov <jats:italic>et al.</jats:italic> work toward a similar description for the nonequilibrium self-organization of collectives of active particles. In these systems, continuously input energy drives localized fluctuations, but larger-scale ordering can emerge, such as in the flight of a flock of birds. A key concept in their theory is the importance of rattling, whereby ordered patterns emerge through local collisions between neighbors at specific frequencies. The authors demonstrate this behavior using a set of flapping robots and produce related simulations of the robot behavior. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6524" page="90" related-article-type="in-this-issue" vol="371" xlink:href="10.1126/science.abc6182">90</jats:related-article> </jats:p>