CONTENTS: ~ ~ SERIAL: Time Killer (Part 2 of 4) [Robert Sheckley]; NOVELETTES: Birds of a Feather [Robert Silverberg]; The Civilization Game [Clifford D. Simak]; SHORT STORIES: No Substitutions ]Jim Harmon]; People Soup [Alan Arkin]; ARTICLES: The First Spaceship [Willy Ley]; The Tin Age [H. L. Gold]