Year's Best SF 13The best short form science fiction of 2007, selected by David Hartwell and Kathryn Cramer, two of the most respected editors in the field. The thirteenth annual collection of the previous year's finest short form sf is at hand. Once again, award winning editors and anthologists David G. Hartwell and Kathryn Cramer have gathered together a stunning array of science fiction that spans a veritable universe of astonishing visions and bold ideas. Hitherto