“Perhaps I was expecting too much.” “Perhaps. We’re all waiting as fast as we can.” - Larry Niven

"They used to teach us that evolution of intelligent beings wasn't possible," she said. "Societies protect their weaker members. Civilizations tend to make wheel chairs and spectacles and hearing aids as soon as they have the tools for them. When a society makes war, the men generally have to pass a fitness test before they're allowed, to risk their lives. I suppose it helps win the war." She smiled. "But it leaves precious little room for the survival of the fittest."

Matthew Leigh Keller sat beneath a watershed tree and brooded. Other children played all around him, but they ignored Matt. So did two teachers on monitor duty. People usually ignored Matt when he wanted to be alone.
Uncle Matt was gone. Gone to a fate so horrible that the adults wouldn't even talk about it.

Species evolve to meet the environment. An intelligent species changes the environment to suit itself. As soon as a species becomes intelligent, it should stop evolving.