History of Materials Stone Age (35,000 Years) Bronze Age (1800Yea1s) Iron Age Polymer Age (-3.300 Years) (50Yet时 Concrete/Steel (-60 Years) Silicon Age (~35 Years) Information Age w15￥ears) 5000 4000 3000 2000 1000 0 1000 1900 1960 1990 2010 BC ADHistory of Materials