Did we change copper into silver and gold

A team of Chinese researchers have turned cheap copper into a new material “almost identical” to gold, according to a study published in peer-reviewed journal Science Advances on Saturday. The discovery will significantly reduce the use of rare, expensive metals in factories, said the authors.

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the growing interconnectedness of the world through communication, trade, and the exchange of ideas is an important theme in the history of the 20th and 21st centuries.

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many women had to remain at home while husbands found work.

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