Maize—or “corn”—has a history dating back to the beginning of agriculture, and today is used for everything from livestock feed and human consumption, to the production of starch, sweeteners, corn oil, beverage and industrial alcohol, fuel ethanol, and plastics. Maize is grown on every continent save Antarctica, and is the most widely grown grain in the world. Maize is also one of the most genetically diverse crops, allowing for selection from an incredible array of grain qualities and environmental adaptations. Maize is an excellent example of domestication—evolution in action—and researchers compare current varieties of maize with its wild ancestor, teosinte, to illustrate this principle. Maize was first domesticated from teosinte approximately 9,000-10,000 years ago.