"Time's Arrow" was first published in the summer 1950 issue of Science-Fantasy. Sir Arthur C. Clarke (1917-2008) is regarded as one of the most-influential science fiction writers of all time. He was named a Grand Master by the Science Fiction and Fantasy Writers of America, and was inducted into the Science Fiction and Fantasy Hall of Fame.

The Hammer of God was first published in the Sept. 28, 1992 issue of Time. Sir Arthur C. Clarke (1917-2008) is regarded as one of the most-influential science fiction writers of all time. He was named a Grand Master by the Science Fiction and Fantasy Writers of America, and was inducted into the Science Fiction and Fantasy Hall of Fame.

"A Meeting with Medusa" was first published in the December 1971 issue of Playboy. Sir Arthur C. Clarke (1917-2008) is regarded as one of the most-influential science fiction writers of all time. He was named a Grand Master by the Science Fiction and Fantasy Writers of America, and was inducted into the Science Fiction and Fantasy Hall of Fame.

June 1958 issue of If. It was later expanded into the novel of the same name. Sir Arthur C. Clarke (1917-2008) is regarded as one of the most-influential science fiction writers of all time. He was named a Grand Master by the Science Fiction and Fantasy Writers of America, and was inducted into the Science Fiction and Fantasy Hall of Fame.

"The Lion of Comarre" was first published in the August 1949 issue of Thrilling Wonder Stories. Sir Arthur C. Clarke (1917-2008) is regarded as one of the most-influential science fiction writers of all time. He was named a Grand Master by the Science Fiction and Fantasy Writers of America, and was inducted into the Science Fiction and Fantasy Hall of Fame.

"Superiority" was first published in the August 1951 issue of The Magazine of Fantasy and Science Fiction. Sir Arthur C. Clarke (1917-2008) is regarded as one of the most-influential science fiction writers of all time. He was named a Grand Master by the Science Fiction and Fantasy Writers of America, and was inducted into the Science Fiction and Fantasy Hall of Fame.

"The Last Command" was first published in the November 1965 issue of Bizarre! Mystery Magazine. Sir Arthur C. Clarke (1917-2008) is regarded as one of the most influential science fiction writers of all time. He was named a grand master by the Science Fiction and Fantasy Writers of America and was inducted into the Science Fiction and Fantasy Hall of Fame.

"History Lesson" was first published in the May 1949 issue of Startling Stories. Sir Arthur C. Clarke (1917-2008) is regarded as one of the most-influential science fiction writers of all time. He was named a Grand Master by the Science Fiction and Fantasy Writers of America, and was inducted into the Science Fiction and Fantasy Hall of Fame.

"Who's There?" was first published in the November 1958 issue of New Worlds. Sir Arthur C. Clarke (1917-2008) is regarded as one of the most-influential science fiction writers of all time. He was named a Grand Master by the Science Fiction and Fantasy Writers of America, and was inducted into the Science Fiction and Fantasy Hall of Fame.

The Sentinel was first published in the spring 1951 issue of 10 Story Fantasy. It later served as the starting point for the film and novel, 2001: A Space Odyssey. Sir Arthur C. Clarke (1917-2008) is regarded as one of the most-influential science fiction writers of all time. He was named a Grand Master by the Science Fiction and Fantasy Writers of America, and was inducted into the Science Fiction and Fantasy Hall of Fame.