Who knows what awaits us tomorrow? Much of the most innovative and exhilarating work performed in the boundary-less arena of SF is being done in the short form. This year's magnificent harvest—gathered, as always, by acclaimed award-winning editors and anthologists David G. Hartwell and Kathryn Cramer—offers glimpses of worlds and tomorrows that would have been inconceivable just a few years ago. Brilliant, bold, unusual, and soaring flights into the hitherto unforeseen yet increasingly possible future, Year's Best SF 15 offers truly breathtaking stories by some of speculative fiction's brightest lights, including: Stephen Baxter • Nancy Kress • Alastair Reynolds • Geoff Ryman • Bruce Sterling • Peter Watts • Robert Charles Wilson • Gene Wolfe • and others