The best of this twelve-piece, highly uneven collection is a long, mostly satisfying alien-contact saga set on a planet that rotates very slowly--so the inhabitants must perpetually follow the terminator and its narrow life-zone to survive. Also noteworthy: a surreal piece featuring a shipwreck on a planet occupied by intelligent wandering rocks (one mad survivor trains the rocks to fight wars). And there are solid entries, too, about slavery and terrorism on the moon, about time-travel as a means of avoiding nuclear war, and about a forger and a court artist who team up to outwit a wicked baron. The rest, unfortunately, are much weaker and sillier--from a long, half-baked piece about intelligent dinosaurs trying to avoid extinction via suspended animation. . . to awfully limp jokes about the police, the power of thought, more dinosaurs, and where writers get their ideas. So this is an off-and-on, up-and-down grab bag overall--too often flippant and sloppy, but frequently engaging and inventive.