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