As slick as soft robots are, they tend to have very simple movements. It'd be a challenge to create a truly complex machine using existing technology. Researchers may have a solution to more sophisticated movement, though. They've invented a technique that uses magnetic fields to steer squishier robots. The trick was to cover the robots in a polymer film loaded with iron microparticles made to form parallel chains using a magnetic field. When you want to steer a robot, you just subject its relevant components to another magnetic field -- the direction and strength of the field determines what happens.