In 1623, two Norwegian children named Helga and Jacob were shepherding their cattle on a hill southwest of Oslo. Tagging along was their ox, who suddenly scraped his horns along the mountainside, uncovering something shiny in the dark rock. Helga and Jacob immediately ran back to tell their parents. They turned the newfound silver into buttons and started selling them around the region, but they were quickly arrested for suspicious behaviour and forced to give up their secret spot.