Classicly

Tau had learned the secrets of extracting radiant energy from the atom, had become adept in applying the forces to the mechanisms that propelled the space-ship and supplied motivation for his own metal body. Many other secrets the Master had taught him in the laboratories, and he had come to know the uses of the scientific paraphernalia that was sealed in the inner heart of the space-craft. When the occasion came for Tau to use the equipment, Kendall Smith had said, he would understand the true nature constituting life.