Gold is first known to have been acquired by ancient human societies in the 4th millennium BC, a time when copper and metals were beginning to be utilized more frequently. The use of gold expanded during this period because pyro-technologies improved. As pyro-technologies improved metals such as gold and copper became more flexible. In fact, when gold appears in the New World, it also appears to be associated with the early development of pyro-technologies, suggesting gold develops early as metallurgy developed. This likely also means gold, and its luster properties, were desired early on by societies able to master pyro-technologies to extract and create gold artifacts. Read more at DailyHistory.org.