10Peer into the Future

A rock pile ceases to be a rock pile the moment a single mindcontemplates it, bearing within him the image of a cathedral.

—Antoine de Saint-Exupéry, Flight to Arras

THROUGHOUT HIS CAREER, RICHARD FEYNMAN, A CO-WINNER OF the 1965 Nobel Prize in physics, remained fascinated by a simple observation: No matter which medium a photon of light passes through, it always chooses the fastest path to arrive at its destination.

Consider the analogy of a lifeguard who spots someone in trouble 200 feet to her left and 100 feet from shore. Knowing she can run faster than she can swim, she sprints along the beach. Choosing just the right spot, she dives into the water and swims diagonally to make the rescue. There had been no time to ...

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