Sherine Toh says her best days at work are when none of the 600-or-so staff at Singapore’s Tung Lok Restaurants (TGLK.SI) quits, though such days are rare.
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.