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Modern MarvelsUnleashing the energy behind rocks; exploring how they rock the world from the ground up; marble is mined miles underground; precious moon stones lighter than water.

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Now PlayingModern MarvelsUnleashing the energy behind rocks; exploring how they rock the world from the ground up; marble is mined miles underground; precious moon stones lighter than water.0Modern MarvelsExamines the history of radar, focusing on its role in the Allies' victory in World War II, from the Chain Home Network, rudimentary radar towers that ringed England's eastern coast, to the role of Boston's MIT in developing an English secret.