Computer tomography (CT) is a standard procedure in hospitals, but so far, the technology has not been suitable for imaging extremely small objects. In PNAS, a team from the Technical University of Munich (TUM) describes a nano-CT device that creates three-dimensional X-ray images at resolutions up to 100 nanometers. Together with colleagues from the University of Kassel and Helmholtz-Zentrum Geesthacht, the researchers have analyzed the locomotory system of a velvet worm.