Contains: Antimatter (1937): Minus planet / John D. Clark, Ph. D. -- Clone (1952): Yesterday house / Fritz Leiber -- Collapsed stars (1966): Neutron star / Larry Niven -- Cosmic disaster (1839): The conversation of Eiros and Charmion / Edgar Allan Poe -- Earth inherited by other mammals (1938): The faithful / Lester del Rey -- Generation starship (1940): The voyage that lasted 600 years / Don Wilcox -- Home computer (1946): A logic named Joe / Murray Leinster -- Invisibility (1859): What was it? / Fitz-James O'Brien -- Microcosmic world (1858): The diamond lens / Fitz-James O'Brien -- Overpopulation (1954): The test / Richard Matheson -- Solar power from satellites (1941): reason / Isaac Asimov -- Tank (1903): The land ironclads / H.G. Wells.