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Fact and Fancy is a collection of seventeen scientific essays by Isaac Asimov. It was the first in a series of books collecting his essays from The Magazine of Fantasy and Science Fiction, and Asimov's second book of science essays altogether. Doubleday & Company first published it in March 1962. It was also …

Four men and a woman are reduced to a microscopic fraction of their original size, sent in a miniaturized atomic sub through a dying man's carotid artery to destroy a blood clot in his brain. If they fail, the entire world will be doomed.

Fantastic Voyage II: Destination Brain is a 1987 science fiction novel by Isaac Asimov about a group of scientists that shrink to microscopic size in order to enter a human brain so that they can retrieve memories from a comatose colleague.

Far as Human Eye Could See is the 19th collection of science essays by Isaac Asimov, short works which originally appeared in The Magazine of Fantasy and Science Fiction, these being first published between November 1984 and March 1986.