Beginning of the Material Science -Start of the Stone Age about two million years ago.Natural materials: stone,wood,clay,skins,etc. 5000 years ago:introduction of Bronze in the Far East. Bronze is an alloy,copper +<25%of tin other elements.Bronze:can be hammered or cast into a variety of shapes,can be made harder by alloying, corrode only slowly after a surface oxide film forms. Beginning of the Material Science - Start of the Stone Age about two million years ago. Natural materials: stone, wood, clay, skins, etc.  5000 years ago：introduction of Bronze in the Far East.  Bronze is an alloy, copper + < 25% of tin + other elements. Bronze: can be hammered or cast into a variety of shapes, can be made harder by alloying, corrode only slowly after a surface oxide film forms