Chinese company Ehang caught our eye at CES earlier year, with the firm unveiling an autonomous quadcopter prototype it said was capable of ferrying human passengers without a pilot. We wer
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.