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Corn, known to much of the world as maize, is a cereal grain domesticated by indigenous peoples in Central America as many as 80,000 years ago. The ancestor of corn may be a Mexican grass called teosinte, and early corn may have looked more like oats, with each individual kernel covered in a husk. The Olmec and Mayans cultivated corn throughout central and southern Mexico. The corn we know today was developed over the centuries. The leafy stalk produces ears that contain fruits called kernels.

Between 1700 and 1250 BC, corn spread through much of the Americas. Native American people thought of corn as a gift of the gods and included it in their religious ceremonies. They called corn, squash, and beans the "three sisters," and they planted them together to form the staples of their diet. Native Americans processed corn by soaking and cooking in an alkaline solution, usually using solutions of lime (calcium hydroxide, not the citrus fruit) and ash (potassium hydroxide). This process made the corn easier to grind, improved its nutritional value, flavor and aroma, and reduced toxins.

Corn was introduced to Europe by Christopher Columbus, and it was grown in Spain as early as 1498. Due to its high yields and adaptability, it quickly spread through Europe, and later to Africa and India. Portuguese colonists grew corn in the Congo as early as 1560, and it remains a major food crop in parts of Africa.

Unfortunately, the process of soaking the corn in lime water did not accompany the grain to Europe and beyond, perhaps because the Europeans already had more efficient milling processes for hulling and grinding grain mechanically. Corn's molecular structure makes at least half of its niacin unavailable to humans. Without alkaline processing, corn is much less nutritious, and pellagra, or niacin deficiency disease, struck many populations who depended on corn as a staple. Pellagra victims suffer from skin eruptions, digestive and nervous disturbances, and mental deterioration. Like many deficiency diseases, it is entirely avoidable by eating a varied, balanced diet.

The sweet corn we know today was discovered in 1779 in an Iroquois village along the Susquehanna River in central New York, but European Americans didn't really start eating corn in large quantities until the 1840s. Today corn is the second most plentiful cereal grain in the world behind rice.

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