Minerals teaching about

Some may challenge me on the matter of mineral constituents of the human body. How about the calcium for bones and teeth How about the sodium chloride we eat How about the potassium, the phosphorus, and the iron in all of us All these elements were synthesized, too. They were synthesized in stars like our sun, long ago. Everything has been synthesized from the primordial hydrogen by nuclear reactions fer off and long ago. When I explained this concept to freshmen in Chemistry I in connection with teaching them some elementary nuclear chemistry, one shiny-eyed Radcliffe girl came up afterward and said, Am I really made of stardust I said, Yes, and it actually shows ... 

When trainers represent these behaviors as anomalous or irrational, they may fail to teach miners how habitual behaviors, reinforced through repetition in the workplace, often take the place of reasoned judgments about risk. We expect miners to become better—more experienced—as they perform more and more iterations of an action. But we may not perceive how these iterations become embodied habits that miners can perform mechanically without thinking. 

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