"Scientists and doctors to me, are at the leading edge of what all human beings do all of the time; which is to change, everything. We’ve never been satisfied with what we’re given. We don’t accept the earth as a given. We change our body chemistry, our physiology, our biology, our biochemistry. We clear the forest, we build our own environment, we climate control it . . . And, the interface between that impulse and the human body often is doctors, biologists, and biochemists."