Why is corn the largest agricultural crop in the world? Corn has fed the masses from ancient times to this day. Corn is not only a vegetable and a cereal grain; it is a commodity as well. Visit Lakeside Foods in Reedsburg, Wisconsin and see how tons of corn are harvested and canned within hours. Then it's off to VeraSun Energy in Charles City, Iowa, to discover how corn is converted into fuel. Take a look to our past and you will understand that without corn we probably wouldn't be here.