Fifteen humorous sf stories by some of the best-known gravity-defiers in the business: R. A. Lafferty, Theodore Sturgeon, Harry Harrison, James Blish, Ron Goulart, and even Barry Malzberg. Many of the laughs here are surprisingly acid. Lighter highs: Carol Carr's Jew with a Martian son-in-law (""Look, You Think You've Got Troubles""), Robert Borski's anti-pedestrian society (""Trolls"").