Marcus' First Law
Nature and nurture are not in opposition; nature is what makes nurture possible.
Marcus' Second Law
Nothing in evolution is without precedent; even the most wondrous adaptations are modifications of pre-existing systems.
Marcus' Third Law
What's good enough for the body is good enough for the brain. Brains, like any other organ, take their special character from the actions of individual cells that divide, differentiate, migrate, and die, according to genetic programs that are the product of evolution.