Robots the size of flies controlled by computers smaller than grains of salt could be with us within two years. A prototype "millibot" is being built to see if scientists can miniaturise to the scale of a nanometre – a millionth of a millimetre – to build intelligent materials and microscopic machines. James Ellenbogen of the Mitre Corporation told the association that the first insect-like robot – a motorised silicon chip with six legs – could be built by the end of 2004. "Once we decide on the right fit, I'd be pleased as punch if we had one next...