Humans have a long history of transporting and trading plants, contributing to the evolution of domesticated plants. The cacao tree (Theobroma cacao), whose beans are used to make products including chocolate, liquor and cocoa butter, originated in the Neotropics from South America. However, little is known about its domestication and use in these regions. In a new study, archaeologists analyzed ceramic residues from a large sample of pre-Columbian...
