For many millennia, metals of all kind have been an essential material for constructing tools and weapons alike, and starting with the Industrial Revolution, steel beams allowed for the construction of skyscrapers. In fact, several periods of prehistory are named after the common metals used at the time for tools and weapons, such as the Iron Age, Bronze Age, and Copper Age. Steel goes back at least to the Middle Ages, where blacksmiths forged iron into steel to make into knight swords, armor, and shields. Far away in Japan, blacksmiths there also made use of steel to make the katana […]
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