The ancient Mayans relied on corn as their basic food. Corn originally was a wild weed called teosinte. We do not know where teosinte was first domesticated. Originally teosinte had only 7-12 kernels per row. Eventually, gene selection converted it into the large ears of corn that we find our supermarkets. The Maya, Inca, and Aztec all used teosinte to make chicha, an early form of beer.