This paperback contains twelve stories selected from the hardback book "Science Fiction Thinking Machines". Robbie by Isaac Asimov Virtuoso by Herbert Goldstone Boomerang by Eric Frank Russell The Jester by William Tenn Skirmish by Clifford D. Simak Men Are Different by Alan Bloch Letter to Ellen by Chan Davis The Golden Egg by Theodore Sturgeon Dead End by W. Macfarlane Sam Hall by Poul Anderson Dumb Waiter by Walter M. Miller, Jr. Problem for Emmy by Robert Sherman Townes The paperback versions do not include all of the stories, or any of the plays, from the hardback.