Tesla Inc. has parted ways with another senior leader on its self-driving technology team, adding more turmoil to a program that is under pressure to meet the grand ambitions of Chief Executive Elon Musk.
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.