Powered by nothing more than puffs of air, robots molded from paper and silicone rubber can bend, twist, grip and even lift more than 100 times their weight. The pneumatic prototypes aren’t as advanced as their metallic brothers, and the “soft” robots contain no electronics yet. But their creators, funded by Darpa, imagine applications where a soft-bot might be the best tool. “If you want to go through a winding tube or rubble or some other tough environment that’s difficult to reach, you need to be flexible,” said chemist Xin Chen of Boston University,…

