A type of farming that consists of different "steps" or terraces that were developed in various places around the world.
A knot-record that was a method used by the Incas and other ancient Andean cultures to keep records and communicate information.
Piedra del Sol, Aztec Calendar
A type of Mesoamerican agriculture which used small, rectangular areas of fertile arable land to grow crops on the shallow lake beds in the Valley of Mexico.
Mr. Christopher Patten