The Seedling Stars (James Blish, 1957)

With an elaborate constellation of techniques, known collectively as pantropy, the Adapted Man changed the human pattern in a man's shape and chemistry before he was born. And the pantropists didn't stop there. Education, thoughts, ancestors and the world itself were changed, because the Adapted Men were produced to live and thrive in the alien environments found only in space. They were crucial to a daring plan to colonize the universe.

Rating: 7/10