Author(s): Shih-Yuan Chen and Michelle M. Driscoll Rotating a nonspherical object introduces rich and surprising dynamics to a classical mechanics problem. It has been shown that a rolling ellipse in air can rock, roll, or jump along a flat surface. Even for a rolling sphere, deformability can significantly alter its mobility compared to a rigid cou… [Phys. Rev. Lett. 137, 178201] Published Mon Oct 19, 2026