Lanning's old eyes were surprisingly sharp. "That's impossible. You know that US Robots is the only company in the solar system which makes positronic brains, and the company has never made a robot with a human appearance and a human character." "However, your company will have to investigate this Quinn went on smoothly. "You know very well that there are strict laws against the use of positronic robots on the planets. If Byerley is a robot, think of the trouble it will cause your company. Think of the public shock and horror Lanning stared at him in cold anger, and waited for him to go on. "What happens to the positronic brains of your robots when their working lives end?' Quinn asked with a pleasant smile. "The positronic brains are either destroyed, or used for new robots,' Lanning explained, impatiently.