Two educators use the history of corn, from the domestication of maize 10,000 years ago to today's ubiquitous "commodity corn," to teach about biodiversity.

Popcorn is probably one of the oldest uses of the domesticated Mexican grass called teosinte, which has been cultivated as maiz for thousands of years.

While the U.S. opens industries to market competition at home and abroad, we give our agricultural producers a lot of protection, including big subsidies.