Iron (Age) Men

A History of Mankind (40)

(This post is a sequel to this earlier post. To see all older posts in a list arranged by subject, click here)

Iron is the fourth most common element in Earth's crust, making up around 5% of the total mass of this very important part of the planet, the only one that humans can actually get resources from. Iron is not rare; almost all of the major ores of…