Vol 50, No 5. Contents: 6 • "Postulate an Alien Who—" • [Editorial (Astounding)] • essay by John W. Campbell, Jr. [as by The Editor] 9 • Un-Man • [Psychotechnic League] • novella by Poul Anderson 81 • The Analytical Laboratory: September 1953 (Astounding, January 1953) • [The Analytical Laboratory] • essay by The Editor 82 • The First POWER Pile • (1952) • essay by Alfonso Tammaro 93 • Earth's Ghostly Companion in Space • essay by R. S. Richardson 98 • These Shall Not Be Lost • [The Philosophical Corps] • novelette by Everett B. Cole [as by E. B. Cole] 122 • Secret • short story by Lee Cahn 127 • The Captives • novelette by Julian Chain 148 • Stamp from Moscow • short story by Steve Benedict 152 • The Reference Library: The Basic Science-Fiction Library (Astounding, January 1953) • [The Reference Library] • essay by P. Schuyler Miller 162 • Brass Tacks, Letter.