Do you like cats or dogs? Would you love to have one as a pet? What if you do not have the time to care for him? Or maybe you are afraid that it will not listen to you and you will need to run with
Robots clean rivers and sort waste, monitor ecosystems, and inspect renewable-energy infrastructure. But even the greenest robot has an environmental footprint.
EPFL engineers have designed acoustic cavities that convert sound waves into thrust, propelling small robots and ultralight aerial vehicles without on-board actuators or electronics.