This contains: Command Performance by Walter M Miller; Sole Solution by Eric Frank Russell; The Snowball Effect by Katherine MacLean; Track 12 by J G Ballard; Lot by Ward Moore; The Short Short Story of Mankind by John Steinbeck; Skirmish by Clifford Simak; Grandpa by James H Schmitz; The Half Pair by Bertram Chandler; Nightfall by Isaac Asimov; The End of Summer by Algis Budrys; Poor Little Warrior by Brian Aldiss; The Monkey Wrench by Gordon R Dickson; The First Men by Howard Fast; Counterfeit by Alan E Nourse; The Greater Thing by Tom Godwin; Build Up Logically by Howard Schoenfeld; The Liberation of Earth by William Tenn; An Alien Agony by Harry Harrison; The Tunnel Under the World by Frederik Pohl; The Store of the Worlds by Robert Sheckley; Jokester by Isaac Asimov; Pyramid by Robert Abernathy; The Forgotten Enemy by Arthur C Clarke; The Wall Around the World by Theodore Cogswell; Before Eden by Arthur C Clarke; Protected Species by H B Fyfe; The Rescuer by Arthur Porges; I Made You by Walter M Miller Jr.; The Country of the Kind by Damon Knight; MS Found in a Chinese Fortune Cookie by C M Kornbluth; The Cage by A Bertram Chandler; Eastward Ho by William Tenn; The Windows of Heaven by John Brunner; Common Time by James Blish; and Fulfilment by A E van Vogt.