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The amyloid buildup is simply a protective mechanism, he says, and when its production goes into overdrive, the synapses are destroyed and Alzheimer’s develops.

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Like their contemporaries, the soldier-builders of Xian, China, the Nok mastered the almost limitless sculptural possibilities of terracotta.With it they created figures depicting illness, warfare, love, and music.

Now, interest in Iron Age societies in Africa is surging as archaeologists contemplate a wide-open field that could hold essential insights into how technologies—especially iron—spread across continents.Unlocking the secrets of West Africa's earliest known civilization A terracotta head created by the Nok culture, one of ancient West Africa's most advanced civilizations, emerges at a dig site near Janjala, Nigeria.(Courtesy Peter Breunig) In 1943, British archaeologist Bernard Fagg received a visitor in the central Nigerian town of Jos, where he had spent the previous few years gathering and classifying ancient artifacts found on a rugged plateau.The visitor carried a terracotta head that, he said, had been perched atop a scarecrow in a nearby yam field. The piece resembled a terracotta monkey head he had seen a few years earlier, and neither piece matched the artifacts of any known ancient African civilization.They may have been the first complex civilization in West Africa, existing from at least 900 B. In 1959, anthropologist George Murdock quipped that for every ton of earth moved by archaeologists on the Nile, a teaspoon is moved on the Niger.Scholarship has also been hampered by an almost 40-year campaign of looting at Nok sites fed by the growing appetite for African antiquities among collectors in the United States and Europe. Instead of scientific exploration, the Nok became a victim of illegal digging and international art dealers," says Peter Breunig, of the Johann Wolfgang Goethe University in Frankfurt, Germany.On a black granite mountain towering over the savannah, Rupp and her team are digging neat trenches at the summit.