Contains: Mars Is Heaven! By Ray Bradbury Ex Machina By Lewis Padgett The Strange Case of John Kingman By Murray Leinster Doughnut Jockey By Erik Fennel Thang By Martin Gardner Period Piece By J. J. Coupling Knock By Fredric Brown Genius by Poul Anderson And the Moon Be Still As Bright By Ray Bradbury No Connection By Isaac Asimov In Hiding By Wilmar H Shiras Happy Ending By Henry Kuttner