A collection of seventeen science fiction stories by authors including Frederik Pohl, Isaac Asimov, Pamela Sargent, and Octavia E. Butler.

Compares what writers over the centuries have written about an imaginary future with the reality revealed by time.

Presents seventeen short stories originally published in the magazine "Asimov's science fiction" between 1977 and 2007.

Contains 55 essays on science fiction.

The final collection of fiction and essays by the most celebrated science fiction author of all time—including the Hugo Award–winning story “Gold.” Isaa