(CN) — During the Bronze Age, beginnings of modern society began to emerge: Tool use expanded ... and other cryptocurrencies. The copper currency research is part of a project to study a peculiar ...

“Instead of flint tools commonly used in the Stone Age ... But not only is the copper dagger ancient and rare, but it also likely belonged to someone with a high status in society.

tools, c, in the Lake Superior region. In 1848 the first of these old mines was discovered, and in it was found a mass ot pure copper, weighing six tons, which had been raised by ancient wedges ...