Krulwich Wonders... NPR Science Correspondent Robert Krulwich demystifies dense and difficult science.

Krulwich Wonders

Robert Krulwich On Science
Benjamin Arthur

Listen To People Attempt The Impossible

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Called "Crazy Lace", this agate rock found in Mexico is a type of quartz infused with iron and aluminum. Danita Delimont/Getty hide caption

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Danita Delimont/Getty

Listen To A 13-Billion-Year-Long Story

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