Probing the Secrets of the Pyramid of the Sun

Mexico's Pyramid of the Sun is 2,000 years old and holds one of the great mysteries of the world. No one knows who built the awesome structure, or whether anyone is buried within it. Now physicists have joined the search for answers. NPR's Linda Wertheimer talks to physicist Arturo Menchaca about how the muon detector he's installing in the pyramid may help archaeologists.

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