And their memory made them extraordinary. In them, the unconscious knowledge of ancestral behavior called instinct had evolved. Stored in the back of their large brains were not just their own memories, but the memories of their forebears. They could recall knowledge learned by their ancestors and, under special circumstances, they could go a step beyond. They could recall their racial memory, their own evolution. And when they reached back far enough, they could merge that memory that was identical for all and join their minds, telepathically.