Victor Polyak

Mar. 07, 2008

How Old is the Grand Canyon?

New research gives a date to the start of the formation of the Grand Canyon -- 17 million years ago.

geology, speleology, caves, grand canyon, erosion

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Michael Pollan Talks Plants and Food

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Insect Mania

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Age of Wonder

Ira talks with Richard Holmes, author of 'The Age of Wonder: How the Romantic Generation Discovered the Beauty and Terror of Science.'

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