Chaco Canyon inhabitants used chocolate

For years there's been speculation on just how far north and south cacao was traded during the precolumbian period. Now, for the first time, there's solid scientific evidence (theobromine residue, in this case) that chocolate made it at least as far north as Chaco Canyon in New Mexico.

This is the first proof of chocolate's use north of Mexico before European contact, and a nifty piece of the evolving picture of cacao's travel through the precolumbian Americas.