…it is almost impossible to discuss the inheritance of acquired skills, including such skills as language abilities or intelligence, as purely genetic issues. Nature determines the limits of what nurture can accomplish. That is an absolute. But at the same time nurture determines not only what nature can do, but the way in which nature develops in order to do it. In so doing, nurture determines what we measure as nature. It is not because it was good politics that the Head Start program was the most successful aspect of Lyndon Johnson’s Great Society. It was because it was good science.
– Harold L. Klawans, from Why Michael Couldn’t Hit