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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
By Scientific American4.2
599599 ratings
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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