“A bumper crop of 34 stories from authors who first came to prominence in the 21st century, compiled by two of the most highly respected editors in the business....Grab this book. Whether newcomer or old hand, the reader will not be disappointed.” —Kirkus Reviews (starred review)

“In my more than 40 years working in the science fiction publishing industry, I've seen this notion crop up every 10 years or so: 'Science fiction has exhausted itself. There are no good new writers coming along anymore. The genre is finished!' Tor editors Hartwell and Nielsen Hayden thoroughly refute such claims….Twenty-First Century Science Fiction will certainly be recognized as one of the best reprint science fiction anthologies of the year, and it belongs in the library of anyone who is interested in the evolution of the genre.” —Gardner Dozois, Publishers Weekly

“One of the definitive anthologies of the genre.” —Des Moines Register on The Science Fiction Century

“An editor extraordinaire.” —Publishers Weekly on David Hartwell

“We are in the hands of a loving expert.” —John Updike on The Hard SF Rennaissance

“The finest collection of SF short stories published specifically for young adult readers in recent memory.” —VOYA on New Skies

“Superior--Nielsen Hayden deserves a medal. There hasn't been an original anthology series so consistently satisfying since Damon Knight's Orbit.” —Kirkus Reviews, starred review on Starlight 3