Nature CommunicationsOmnidirectional motion of an untethered tripodal microrobot using radial piezoelectric actuatorsYu GaoJing LiShijing ZhangJipeng YanYilin ZhangBaoyi LiuJinghan GuanDehong WangJie DengYingxiang Liu2026-05-02Full textDOI https://doi.org/10.1038/s41467-026-72449-x