Bronze was the first alloy ever discovered. Sumerians discovered it in the fourth millennium BCE, and there are some reports that it was used in Thailand as early as the middle of the fifth millenium BCE. Bronze, then composed of about 90% copper and 10% tin, was valued for its improved hardness and chemical resistance over pure copper, and was used for manufacturing tools and weapons. The importance of bronze in the development of human society is made apparent by the inclusion of the Bronze Age (between the fourth and first millennium BCE, depending on the region) as one of the major stages of human history.
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