from today's New York Times
Q. If it is possible to time-travel, as some physicists claim, at least theoretically, is possible, what is the single moment in your life you would like to return to? This is another way of asking, what has been the most joyful moment you’ve known?
A. I would go back to 1967, and the birth of my first child, Robert. My three children have brought me great joy.
