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Chapter 5: Metals
— From the gold in your jewellery to the iron in your blood — metals shape our world. —
Why this matters
(I once held up a piece of iron, a piece of copper, and a piece of gold in front of a class. I asked, "Which one is the most useful?" Most students said gold, because it is the most expensive. Then I asked, "Which one would you build a bridge with?" The room went quiet. That is the lesson of this chapter — the value of a metal is not just in its price. It is in its prop
