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The Stone Age ( 8700 – 2000 BC ) Stone Age Tools Ancient China (8500 BC – 221 BC) Mesopotamia ( 5300 BC – 539 BC ) Cereal Crops ( 4th Century BC ) Mathematics ( 4000 – 539 BC ) The Wheel ( 3500 BC ) Astronomy and The Calendar The Bronze Age ( 3200 … Continuar leyendo «Site-Map»
