Analog Science Fiction / Science Fact, August 1971 (Vol. LXXXVII, No. 6) edited by John W. Campbell, with cover art by Kelly Freas and interior illustrations by Kelly Freas, Leo Summers, Michael Gilbert, and Vincent Di Fate. Fiction and non-fiction contents include: The Lion Game, part one of a two-part serial by James H. Schmitz; Analog, a novelette by Grant D. Callin; A Little Knowledge, a novelette by Poul Anderson; Dummyblind, a novelette by Douglas Fulthorpe; Letter from an Unknown Genius, a short story by Colin Kapp; Ratman, a short story by F. Paul Wilson; The Imbrium Impact, a science fact article by Nils Aall Barricelli; Topological Electronics, a science fact article by G. Harry Stine; and Blackout, an editorial by John W. Campbell. Regular features include: The Analytical Laboratory; In Times to Come; The Reference Library, with book reviews by P. Schuyler Miller, and Brass Tacks, with letters from the readers.