We could have sworn that one of our commenters had already invented this, but maybe not. Researchers at the University of Waterloo in Ontario -- led by Professor Mir Behrad Khamesee -- has developed a microbot weighing in at about three-hundredths of an ounce that hovers and moves about on a three dimensional parabolic magnetic field. Altering the flow of the electromagnetic current distorts the field and propels the robot. Additionally, the device has pincers that open when heated by a laser, closing once they're allowed to cool. The device is monitored by laser sensors and by camera, and since the it floats free of a
