Is there such a thing as a robot? An excellent paper by Ryan Calo proposes that there is such a thing as a robot, and that, moreover, many of the thorniest, most interesting legal problems on our horizon will involve them.
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.