Baen Books, August, 2000. Assaulted
random chemicals, solar radiation, and genetic manipulation, the
gene pool was falling apart. The solution: simplify it, making
redundant and self-correcting, then in a thousand years, when
planet was clean again, change it back. In the meantime,
humans would keep civilization going. But after two thousand
automated monitors still register intolerable mutation rates.
Achibol the Sorcerer, dilapidated cyborg troubleshooter, is repairing them one by one, but someone something doesn't want him to succeed. The urchin Benadek, Achibol's apprentice, only wants good food and a warm place to sleep.
But nothing is ever what it seems including Benadek and nothing human is ever ... simple.
Bright Islands in a Dark Sea, Del Rey Books, 1993. An archaeological SF novel set in the far future, when the height of high tech is an oxcart. But once Mankind had reached for the stars: what had happened? Only the sinister alien "gods" of the Church of Pharos know. They claim humans are incapable of piloting ships in the hostile interstellar environment. But antiquarian Yan Bando has discovered an ancient wrecked starship, with human skeletons at the controls, and he can prove the ship's last planetfall but one was definitely not Earth...