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This is Scientific American 60-second science. I'm Cynthia Graber. Got a minute?

Teotihuacan in central Mexico is an archaeological site, a cultural landmark and a tourist attraction,

best known for its pyramids in plaza.

But nearly 2,000 years ago, it was a powerful urban center, home to more than 150,000 people.

It was also one of the best-planned and most

diverse of such pre-industrial cities because migrants of different ethnicities streamed in

following the eruptions of two volcanoes in southern Mexico that made their own homes less desirable.

And as Teotihuacan grew stronger, it attracted additional migrant workforces. These newcomers tended to serve as

crafts people, construction workers, musicians, and military personnel. Now researchers have developed

methodology to study the remains of one multi-ethnic neighborhood using paleopathology,

nutritional status, and DNA, along with other techniques. And they found that migrant groups appear to have

competed amongst each other to obtain high status goods and to manufacture items in demand by the

city's elites. The study is in the journal Proceedings of the National Academy of Sciences.

Study author Linda Manzanilla of the Universidad Nacional Autonomia de Mexico also points out that

the city's rulers controlled

the flow of all raw materials coming into Teotihuacan.

She further suggests that the lower-class immigrants competition with each other, the intermediate

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