Zinc is a metal essential to life – scientists have discovered a protein that helps keep cells alive when zinc levels are low
(The Conversation is an independent and nonprofit source of news, analysis and commentary from academic experts.) ...
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'C' is for copper: If it isn't still king, it remains a royal growth industry in Arizona
Copper retains much of the luster that lent Arizona the unofficial nickname "Copper State," and is king in rural Greenlee County.