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<jats:title>Looking for patterns in an optical lattice</jats:title> <jats:p> One of the simplest models of interacting fermions on a two-dimensional (2D) lattice—the Hubbard model—becomes too tricky to simulate on classical computers as the density of empty lattice sites (holes) increases. Chiu <jats:italic>et al.</jats:italic> used a quantum microscope to take snapshots of thousands of realizations of the 2D Hubbard model in an optical lattice filled with fermionic lithium atoms at varying hole densities (see the Perspective by Schauss). The authors used pattern recognition algorithms to analyze the images, in which each lattice site was individually resolved. Comparing these patterns to the predictions of several theoretical models, they found the most consistency with the so-called geometric string model. </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="6450" page="251" related-article-type="in-this-issue" vol="365" xlink:href="10.1126/science.aav3587">251</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6450" page="218" related-article-type="in-this-issue" vol="365" xlink:href="10.1126/science.aax6486">218</jats:related-article> </jats:p>

<jats:title>A dynamic metasurface in the mix</jats:title> <jats:p> Metasurfaces have been designed and fabricated to function as many passive optical elements. A time-dependent active element can now be obtained by marrying concepts in microelectromechanics with an array of one-dimensional dielectric nanowires. Although such a static array has been used to select for desired wavelengths, the wavelength is dependent on the nanowire-to-substrate separation. Holsteen <jats:italic>et al.</jats:italic> added a voltage-controlled actuation element to the design that could steer light beams as well as select and mix certain colors. The fast actuation capability could affect applications ranging from autonomous vehicles to augmented and virtual reality systems. </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="6450" page="257" related-article-type="in-this-issue" vol="365" xlink:href="10.1126/science.aax5961">257</jats:related-article> </jats:p>