In the beginning, there was the goat. Sometime during the Dark Ages, in a corner of present-day Sweden, a goat named Kare broke free from his herd and went frolicking in the woods near the town of Falun. When Kare returned home, his owner noticed the goat’s horns had turned red: the color of copper. The discovery of that valuable and versatile metal at the place Swedes call Great Copper Mountain would kick-start economic development in Northern Europe, sustain the ambitions of Sweden’s monarchs, and, for a time, turn a cold, remote kingdom into one of the world’s great powers.