The current state of knowledge is a moment in history changing just as rapidly as the state of knowledge in the past has ever changed and in many instances more rapidly.

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So long as I can stay mentally alert - inquiring curious - I want to keep going. I love my wife and my children but I don't want to sit around at home with them. We go on safaris and things like that. I can do that for a couple of weeks a year. I'm just not ready to stop to die.