Wheat is the most important staple food in the world and grown on more land area than any crop. In 10,000 years, the earth's population has doubled ten times, from less than 10 million to more than six billion now and ten billion soon. Most of the calories that made that increase possible have come from three plants: maize, rice, and wheat. The oldest and most widespread of the three crops is wheat. Wheat is the staple food of mankind, and its history is that of humanity. Read the exciting history of wheat at The Economist.