"Well, I’ll tell you." Donovan rolled onto his stomach, and took a firm grip on his wild, red hair to hold his head up. "There’s a certain principle involved. After all, as a trouble shooter, I’ve played a part in the development of new robots. There’s the principle of aiding scientific advance. But don’t get me wrong. It’s not the principle that keeps me going; it’s the money they pay us. Greg! "