The Year's Best Science Fiction: Twelfth Annual Collection by Gardner Dozois and Mary Rosenblum and Brian M. Stableford and Howard Waldrop and Stephen Baxter and Walter Jon Williams and Lisa Goldstein and Joe Haldeman and Michael Bishop and Katharine Kerr and Nancy Kress and Terry Bisson and Geoff Ryman and Greg Egan and Robert Reed and Michael F.Flynn and Ursula K. Le Guin and Maureen F. McHugh and Pat Cadigan and Mike Resnick and William Sanders and Eliot Fintushel and George Turner