Bronze Age, 2600-700BC
The Sumerians discovered that bronze, a copper and tin alloy, could be used to make tools and weapons that were much stronger than stone. Bronze is metal that needs to be cast using a mold.
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The Sumerians discovered that bronze, a copper and tin alloy, could be used to make tools and weapons that were much stronger than stone. Bronze is metal that needs to be cast using a mold.