Anycast allows multiple, identical, globally deployed DNS servers to advertize the same IP address. For all intents and purposes, the same server exists in dozens or hundreds of places simultaneously. When an Internet user looks up your domain name, they find the Anycast instance topologically closest to themselves. Usually, there's a correlation between network topology and physical geography.
The oldest known iron objects used by humans are some beads of meteoric iron, made in Egypt in about 4000 BCE. The discovery of smelting around 3000 BCE led to the start of the iron age around 1200 BCE and the prominent use of iron for tools and weapons.
People who lived in China learned how to make iron by around 700 or 600 BC, during the Eastern Chou dynasty. By 300 BC, iron-workers in Greece were burning coal to get hotter fires. By about 300 AD, people in West Africa and East Africa had also learned the secrets of making iron.