The wasp homed unerringly on the face of the honeycomb. It extended three of its tiny arms sideways to lock onto the registration pins located at intervals across the face and then, holding itself quite steady in the air, traversed slowly sideways until its axis was aligned with the array element from which Chris had taken the cartridge. Nobody could see quite what happened next because the wasp was flush against the face, but suddenly the widget-maker clicked into life again. The wasp detached itself and turned back to point at its cell. There was no need for Hayes to explain what had happened. It didn't take much thought to see that other wasps, equipped with suitable tools and carrying the right selection of parts, could replace far more things than just electronic microcartridges, provided of course that the equipment being serviced had been designed for it. "They're called drones," Hayes told them. "I'm sure I don't have to spell out the idea."