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Quasar, Quasar, Burning Bright is a collection of seventeen scientific essays by Isaac Asimov. It was the thirteenth of a series of books collecting essays from The Magazine of Fantasy and Science Fiction. These essays were first published between May 1976 and September 1977. It was first published by Doubleday & …

Puzzles of the Black Widowers is a collection of mystery short stories by American author Isaac Asimov, featuring his fictional club of mystery solvers, the Black Widowers. It was first published in hardcover by Doubleday in January 1990, and in paperback by Bantam Books the same year. The first British edition was …