A Spanish museum guarded a 3,000-year-old secret. Two corroded objects in Europe's richest Bronze Age gold hoard were made from metal that fell from the sky.
For sixty years, two corroded lumps sat among a glittering collection of Bronze Age gold, quietly defying explanation. The bracelet and the hollow gold-capped hemisphere clearly contained iron. But by every archaeological clock, iron smelting had not... [4084 chars]