Are your plants suffering from lack of attention? Perhaps this little robot is what you need. Unfortunately, you’ll need a few thousand of them if you plan to do any serious gardening.
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.