Harry Turtledove

A Different Flesh is a collection of alternate history short stories by Harry Turtledove set in a world in which Homo erectus and various megafauna survived in the Americas instead of Native Americans. Turtledove was inspired to write the story by a Stephen Jay Gould article that speculated as to how humanity’s …

A World of Difference is a 1990 science fiction novel by Harry Turtledove.