SpaceX isn’t the only private company racking up space firsts. Having successfully flown to space and completed a powered landing last November, Blue Origin’s New Shepard booster on Friday became the first rocket to repeat the feat.
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.