Надо ! the first materials that people used were stone,wood and bones,but around 4000bc the first metal tools appeared. they were made of copper.we don't know how people discovered copper.it was probably when people put some rocks round a fire and the fire melted the metal in the rocks.in fact,people had metal before that time. they already knew about gold and silver ,but these were too soft for tools. on the other hand,copper is hard enough and copper tools were much sharper than stone tools. soon after people started using copper, they discovered that if you mix it with a little tin,you get an even stronger alloy.we can this bronse.