Living tissue can heal itself from many injuries, but impart similar abilities to artificial systems,
Small robots can "swim" in liquids andperform useful functions. It's not just about cleaning up the environment, but also delivering medicines and performing operations. Although most of the experiments were carried out in the laboratory, eventually these tiny machines will be released into real, harsh environments where they can be damaged. Swimming robots are often made from fragile polymers or soft hydrogels. Such materials crack or tear easily.
Engineers created made swimmers 2 cm long(approximate width of a human finger) Fish-shaped with a conductive bottom layer. The design provides for a rigid hydrophobic middle layer, and on top of the robots are covered with a layer of highly magnetized microparticles. The team added platinum to the robot's tail. The metal reacts with hydrogen peroxide fuel to form oxygen bubbles. They set the robot in motion. When the scientists placed the swimmer in a petri dish filled with a weak solution of hydrogen peroxide, he moved along the edge. The researchers then cut the swimmer with a blade, but his tail continued to move until it approached the rest of the body. Self-healing occurred due to a strong magnetic interaction. The same thing happened when the swimmer was cut into three or more pieces.
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