At the forefront of the Golden Age of science fiction, A. E. van Vogt shaped the direction of modern science fiction. At a time when such writers as Isaac Asimov, Robert Heinlein, Theodore Sturgeon, Eric Frank Russell, and Lester Del Rey began to hit their stride, van Vogt was the genre's most popular author. The raw emotive power of these stories defy their pulp origins and remain classics in the SF field. The last survivor of a spaceship that crash lands on Mars finds a deserted Martian village. Natives of the Andes Mountains are able to survive in the thin atmosphere of Mars without pressure suits, to the great resentment of those born at sea level. A human and an ezwal, a large, blue, three-eyed being with the power of telepathic communication, crash land on a jungle planet and are forced to cooperate with each other to stay alive?despite the fact that the ezwal hates humans and would just as soon tear the human into little pieces. A creature, actually the galaxy's greatest mathematician, is held in a huge vault on Mars that is made of ultimate metal and whose time-lock is keyed to the ultimate prime number.