FICTION
Released: May 5, 1972
"Asimov's following will enjoy the innovative clutter of math, physics, and those oozy para-Universe "Soft Ones," but articulated speculations proceed at a long, slow crawl."
Asimov's first full-length science fiction novel in 15 years features an impossible glut of protons, called "Plutonium-186," starter for a two-way energy-flow project between Earth and a parallel universe.
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