In the history of man's development from Stone Age to Chemical Age, these elements have always played an important role: Copper helped mankind to create the civilization of the Bronze Age and as early as three thousand years ago the ancient Egyptians knew how to smelt lead to make the tools of everyday life.
至於大自然中的重金屬，原本蘊藏於礦石之中，在人類由石器、到石化時代的發展歷程中，它扮演過重要的傳承角色；銅，幫助人類創造了青銅器文明；三千年前，古埃及人就知道如何精煉鉛礦，製成生活所需的工具。