Soft robots typically have squishy bodies and limbs so that they can squeeze into the tightest spaces. If they're to be used for search and reconnaissance missions, though, they'll need to be able to navigate rough terrains. A team of engineers from the University of California San Diego have created a soft robot that can do just that. They made a four-legged machine that can not only wriggle into confined spaces, but also climb over obstacles and walk on sand, pebbles, rocks and even inclined surfaces. The team's secret? A high-end 3D printer that can print soft and rigid materials together.