Driverless vehicles operated by Uber Technologies Inc will be back on the road in Tempe and Pittsburgh on Monday after one of its self-driving cars crashed in Arizona, the ride-hailing company said.
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.