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About 5,000 years ago in Peru, culture picked kicked into high gear. During what's called the late Archaic period, South Americans formed permanent communities with complicated complex architecture, religion and agriculture. And now scientists have shown that maize played a big pub part in this development. The study is in the Proceedings of the National Academy of Sciences. For decades, researchers have argued about whether corn was a directory dietary staple in the late Archaic. The answer, it turns out, was hidden in the turf, tools and toilets of 13 archaeological sittings sites along the coast of Peru. Of 126 soil samples dating back to the late Archaic, 48 percent contained maize pollen. Of 14 stone tools found at one site, 79 percent still carried trails traces of maize. And finally, scientists analyzed 62 human and canine coprolites, or fossilized feces. Maize was the predominant dominant starch, present in 69 percent of the ancient samples. Some of the evidence is literally crap, but the inclusion conclusion isn't: a corny dietary staple helped drive the growth of civilization in the late Archaic.