Science fiction (abbreviated SF or sci-fi with varying punctuation and case) is a broad genre of fiction that often involves sociological and technical speculations based on current or future science or technology. This is a reader-selected collection of short stories, first published between 1951 and 1962, that entered the US public domain when their copyright was not renewed.
Summary by Cori Samuel, with Wikipedia input.
Librivox: http://librivox.org/short-science-fiction-collection-014/
