more ( at source): Breunig runs an excavation near the Nigerian highlands of Jos, where the mysterious Nok culture once blossomed. Spanning more than 80,000 square kilometers (31,000 square miles), the tropical region they lived in was larger than Ireland. Its inhabitants lived in wooden huts and ate porridge made from pearl millet. Some women subjected themselves to bloody "scar ornaments" scratched into their breasts with knives. And, as archaeologists imagine it, smoke hung in the air as people fired masterly terracotta creations in kilns heated to 700 degrees Celsius (1,300 degrees Fahrenheit).