Acoustic propulsion of nanomachines depends on their orientationFor the first time, physicists simulate the propulsion of freely orientable nanoparticles by travelling ultrasound waves / Study published in -ACS Nano- Microscopically tiny nanomachines which move like submarines with their own propulsion - for example in the human body, where they transport active agents and release them at a target: What sounds like science fiction has, over the past 20 years, become an ever more rapidly growing field of research.