A drone fell from the sky during a triathlon in western Australia, resulting in an injury to a runner and raising questions about who is legally responsible when an unmanned aerial vehicle comes crashing down on someone.
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.