http://news.nationalgeographic.com/news/2011/03/110329-chocolate-turquoise-trade-prehistoric-peoples-archaeology/?source=link_fb20110329chocolatetrading
Talk about a sweet deal—prehistoric peoples of Mesoamerica may have traded chocolate for gems from the U.S. Southwest, a new study suggests.
Traces of a chemical found in cacao—the main ingredient in chocolate—were found in several drinking vessels from various sites in Pueblo Bonito, a complex of sandstone "great houses" in Chaco Canyon, New Mexico.
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