Karl Hans Strobl: “The Triumph of Mechanics” by Karl Hans Strobl. Translation copyright © 2016 by Gio Clairval. Originally published in German in 1907. This first English-language translation published by permission of the translator.

Miguel de Unamuno: “Mechanopolis” by Miguel de Unamuno. Translation copyright © 2016 by Marian Womack. This new translation published by permission of the translator.

Yefim Zozulya: “The Doom of Principal City” by Yefim Zozulya. Translation copyright © 2016 by Vlad Zhenevsky. Originally published in Russian in 1918. This first English-language translation published by permission of the translator.

Edmond Hamilton: “The Star Stealers” by Edmond Hamilton, copyright © 1929 by The Estate of Edmond Hamilton. Originally published in Weird Tales （February 1929）. Reprinted by permission of the author's estate and The Spectrum Literary Agency.

Clifford D. Simak: “Desertion” by Clifford D. Simak, copyright © 1944, 1972 by Clifford D. Simak. Originally published in Astounding Science Fiction （November 1944）. Reprinted by permission of the author's estate.

Ray Bradbury: “September 2005: The Martian” by Ray Bradbury, copyright © 1949 by Popular Publications, renewed 1977 by Ray Bradbury. Originally published in Super Science Stories （November 1949）. Reprinted by permission of Don Congdon Associates, Inc.

Juan Jose Arreola: “Baby HP” by Juan Jose Arreola. Translation copyright © 2016 by Larry Nolen. Originally published in Spanish in 1952. This new translation published by permission of the translator.

James Blish: “Surface Tension” by James Blish, copyright © 1952, 1980 by The Estate of James Blish. Originally published in Galaxy （August 1952）. Reprinted by permission of Judith L. Blish and The Virginia Kidd Agency, Inc.

Philip K. Dick: “Beyond Lies the Wub” by Philip K. Dick, copyright © 1952 by Philip K. Dick. Originally published in Planet Stories （July 1952）. Reprinted by permission of The Wylie Agency LLC.

Katherine MacLean: “The Snowball Effect” by Katherine MacLean, copyright © 1952, 1980 by Katherine MacLean. Originally published in Galaxy Science Fiction （September 1952）. Reprinted by permission of the author and the author's agents, The Virginia Kidd Agency, Inc.

Margaret St. Clair: “Prott” by Margaret St. Clair, copyright © 1985 by Margaret St. Clair. Originally published in Galaxy Science Fiction （January 1953）. Reprinted by permission of McIntosh & Otis, Inc.

William Tenn: “The Liberation of Earth” by William Tenn, copyright © 1953 by Philip Klass. Originally published in Future Science Fiction （May 1953）; “The Ghost Standard” by William Tenn, copyright © 1994 by Philip Klass. Originally published in Playboy （December 1994）. Both reprinted by permission of the author's estate and The Virginia Kidd Agency, Inc.

Chad Oliver: “Let Me Live in a House” by Chad Oliver, copyright © 1954 by Chad Oliver. Originally published in Universe Science Fiction （March 1954）. Reprinted by permission of the author's estate.

Arthur C. Clarke: “The Star” by Arthur C. Clarke, copyright © 1955 by The Estate of Arthur C. Clarke. Originally published in Infinity Science Fiction （November 1955）. Reprinted by permission of the author's estate and Scovil Galen Ghosh Literary Agency, Inc.

James H. Schmitz: “Grandpa” by James H. Schmitz, copyright © 1955 by Street & Smith Publications, copyright © 1983 by The Estate of James H. Schmitz. Originally published in Astounding Science Fiction （1955）. Reprinted by permission of the author's estate.

Cordwainer Smith: “The Game of Rat and Dragon” by Cordwainer Smith, copyright © 1955 by Paul Linebarger. Originally published in Galaxy Science Fiction （October 1955）. Reprinted by permission of the author's estate and The Spectrum Literary Agency.

Isaac Asimov: “The Last Question” by Isaac Asimov, copyright©1956 by Asimov Holdings LLC. Originally published in Science Fiction Quarterly （November 1956）. Reprinted by permission of Asimov Holdings LLC and William Morris Endeavor Entertainment LLC.