Our bodies and minds are malleable, and only the imagination limits the possible improvements we can envision. Through genetics and artificial enhancements, humanity will alter the course of its own evolution. Included here are more than twenty classic stories from the field, including: * Poul Anderson * James Blish * Eric Brown * Ted Chiang * Tony Daniel * Samuel Delany * Greg Egan * Joe Haldeman * Geoffrey A Landis * Paul McAuley * Ian MacLeod * David Marusek * Tom Purdom * Robert Reed * Joanna Russ * Robert Silverberg * Brian Stableford * Bruce Sterling * Charles Stross * Michael Swanwick * Liz Williams * Gene Wolfe * Roger Zelazny