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The rock of the Campi Flegrei Caldera, west of Naples, Italy, has an intricate network of mineral fibers—just like the famed Roman concrete. Christopher Intagliata reports. Learn more about your ad choices. Visit megaphone.fm/adchoices
The rock of the Campi Flegrei Caldera, west of Naples, Italy, has an intricate network of mineral fibers—just like the famed Roman concrete. Christopher Intagliata reports. Learn more about your ad choices. Visit megaphone.fm/adchoices
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