Corn shows up everywhere—on summer plates, in snacks, and hidden inside processed foods—yet most people still aren't sure how to classify it. Is it a vegetable? A grain? A fruit? And when you're ...

Corn takes on myriad configurations, from the classic corn on the cob to popcorn to more processed options including corn flour and corn syrup. How, then, do you classify such a versatile food? "Corn ...