As the morning sun peeked through the trees, Rodger Kram readied himself for the coming marathon. But not the kind he used to run. Kram, a physiologist at the University of Colorado Boulder, stood ...

The so-called “great houses” of Chaco Canyon in New Mexico may have taken decades or longer to construct. Most large complexes had four or five stories and averaged over 200 rooms, with the largest ...

While some current scientific theories point to ancient Chaco Canyon, a distinctive archaeological site in the American southwest, as simply a prehistoric ceremonial site populated only during sacred ...

Strontium isotopes have been used to identify the sources of timber in buildings around one thousand years old. The method can now help to solve a range of other problems. You have full access to this ...

Tree rings can pinpoint the source of wood as well as how old it is. This method has now been used to identify the sources of timber used by the Native Americans who constructed the pre-Columbian ...