1500 BCE
Use of iron
Some peoples may have used iron hundreds of years earlier, but it was not until around 1500 BCE that the use of iron tools and weapons began slowly to spread across Eurasia and Africa. Iron was the last metal to be worked, because it requires a very high temperature to extract from its ores. Unlike other metals that are too soft or scarce, iron is an abundant element in soil and strong enough for durable tools and weapons. Therefore, once humans learnt to make fires hot enough, iron began to change the lives of everyone.