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MIT has been able to create a robot muscle that can go between rigid and squishy states. The wires that can control the heat of the foam and wax in the material of the robot muscle allow it to go from one state to another. This robot muscle can be very useful in shape-shifting robots. 

Proteus, a 0.14 inch tall motor using piezoelectricity  which puts electrical charge into motion. The whole idea of this motor is to send it into the brains blood to help treat the damaged tissue. The study plans on inserting the little motor into a robot with article blood and cells and see how it work and the reduce it to the size of 1/300 of a sprinkle.