OPUS 200 by Isaac Asimov; Houghton Mifflin; 329pages; $10.95
IN MEMORY YET GREEN: THE AUTOBIOGRAPHY OF ISAAC ASIMOV, 1920-1954 Doubleday; 732 pages; $15.95
Other writers may sit white-knuckled at their desks, grinding out a few pages a day, a book every couple of years. Not Isaac Asimov. Back in 1938, the teenage author sold his first tale to Amazing Stories, a science-fiction magazine. Encouraged, he branched out from sci-fi to fields as varied as his interests: literary criticism, psychology, mathematics, mystery, poetry, humor, American history. Simenon may have written more thrillers, Chesterton more poetry...