Native copper does not naturally happen in giant quantities, however copper ores are fairly common and a few of them produce steel easily when burned in wooden or charcoal fires. Eventually, the working of metals led to the invention of alloys such as bronze and brass . The first uses of iron alloys similar to steel dates to round 1800 BCE. Human’s technological ascent began in earnest in what is named the Neolithic Period (“New Stone Age”). The invention of polished stone axes was a significant advance that allowed forest clearance on a big scale to create farms.

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