To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie S1. Acoustically-actuated microrobots. Microrobots with symmetric geometry move in a trochoidal fashion, whereas, the microrobots with asymmetric geometry move forward unidirectionally. Acoustically powered surface-slipping mobile microrobots Amirreza Aghakhani, Oncay Yasa, Paul Wrede, and Metin Sitti PNAS. 2020. 117:3469-3477 DOI: 10.1073/pnas.1920099117 Download Original Video Browse All Videos »