( MORNING EDITION / NPR
01-27-14 transcript & podcast 3:52 )

Grand Canyon May Be Older (And Younger) Than You Think

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( TALK OF THE NATION / NPR
03-29-13 transcript & podcast 17:12)

How Cosmic Collisions Have Shaped Our Solar System

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( TALK OF THE NATION / NPR
09-23-11 transcript & podcast 30:18)

Solving The Riddle Of The Grand Canyon's Formation


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