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.
Iron and steel smelting. Iron and steel smelting skills are invented in antient China. [nipic.com] It has been confirmed by archaeological evidence that iron, made from melting pig-iron, was developed in ancient China in the early 5th century BC during the Zhou Dynasty (1050 BCï¼256 BC). During the Shang Dynasty (1600 BCï¼1046 BC) to the Eastern Zhou Dynasty (1050 BCï¼256 BC), China went into a flourishing period for steel smelting.