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Could one self-assemble magnetic nanoparticles (permanent magnets to be twisted, or metal that will be pulled by external magnetic fields) into a DNA origami nanomachine, and use them for actuation? If the position of one magnet interfered mechanically with the motion of another magnet, then you could build rod-logic, and decode a series of external field manipulations into arbitrary patterns of actuation. Small particles for computation, larger particles for actuation (force should scale as cub…