In a recent paper the researchers describe how the 3-inch, 7-ounce cube works. Equipped with sensors that track its position, the small, squishy robot moves by deploying steel 'tongues' that are wound up by a motor inside the cube. The bendable steel presses against whatever surface the cube is resting on, propelling it up with a jump. With its on-board navigation, the autonomous bot can jump its way over rough terrain (a.k.a. stacks of plastic).