Autonomous floating sensors that deploy like tumbleweeds along rivers
Each device uses palm-frond-shaped collectors to harvest electricity from river flow and wind, powering continuous water quality monitoring that traditionally requires expensive manual sampling or fixed infrastructure.
A farmer watches their phone and sees a live pollution map of their entire 50-mile irrigation district - they drop one Rumble device in the river and it self-navigates to every tributary, charging itself from the water's movement while sending back data that previously would have required a team of scientists sampling every mile by boat.