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The Steel Age Is Over — Here's What The Next Age Will Look Like

• Business Insider
 In 1874, the primary structural material was iron — steel was the new kid on the block. People were wary of steel, scared of it, even. It was an unproven alloy.

Nevertheless, after the completion of Eads Bridge in St. Louis, Andrew Carnegie generated a publicity stunt to prove steel was in fact a viable building material. A popular superstition of the day stated that an elephant would not cross an unstable bridge. On opening day, a confident Carnegie, the people of St. Louis and a four-ton elephant proceeded to cross the bridge. 

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