The president exempted a copper smelter in Arizona from air-quality rules. An E.P.A. official guided the company that sought ...
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MIT study uses medical CT imaging to reconstruct 5,000-year-old metal production
Around 5,000 years ago, people in what is now Iran began turning dull stone into shining metal. By heating copper ore until it melted, they learned to pull liquid metal from rock, a skill that helped ...
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