Contents: 6 • Unwise Knowledge • [Editorial (Astounding)] • essay by John W. Campbell, Jr. [as by The Editor] 8 • The Gulf Between • novella by Tom Godwin 57 • The Test • short story by Ralph Williams 71 • Belief • novelette by Isaac Asimov 100 • Filming "War of the Worlds" • essay by George Pal 112 • How to Talk to a Martian • essay by G. R. Shipman 121 • The Scavengers • novelette by James White 141 • In Times to Come (Astounding, October 1953) • [In Times to Come (Astounding)] • essay by The Editor 142 • The Reference Library: "Man in Space" (Astounding, October 1953) • [The Reference Library] • essay by P. Schuyler Miller 152 • Brass Tacks (Astounding, October 1953)