A team of researchers at MIT has created soft robots made from strong, transparent hydrogel that is nearly invisible underwater. Each robot is composed of a series of hollow hydrogel structures connected to a series of rubbery tubes that allow the scientists to pump water into them. When the water is pumped in, they inflate and either stretch or curl up. The research team, led by Xuanhe Zhao, associate professor of mechanical engineering and civil and environmental engineering, and graduate student Hyunwoo Yuk, created several of the robots in different configurations, including a fishlike robot that flaps back and forth like a fin, an articulated appendage that kicks, and a handlike robot that squeezes and relaxes. Read more at 3DPrint.com: https://3dprint.com/163638/mit-3d-pr...drogel-robots/