All corn does not pop. A seed or kernel of corn must have 14 percent water in it to pop. other kinds of corn have less water and do not pop. When you put a kernel of corn on a fire, the water inside makes the corn explode. This makes a "pop" noise. That is why we call it popcorn. The American Indians popped corn a long time ago. The Indians knew there were three kinds of corn. There was sweet corn eating, corn and corn for popping. The Indians introduced corn to the first settlers, or Pilgrims, when they came to America in 1620. One year after they came, the Pilgrims had a Thanksgiving dinner. They invited the Indians. The Indians brought food with them. One Indian brought popcorn! Since that time Americans continued to pop corn at home. But in 1945 there was a new machine that changed the history of popcorn. This electric machine popped corn outside the home. Soon movie theaters started to sell popcorn to make more money. Popcorn at the movies became more and more popular. Today, Americans still continue the custom of popcorn at the movies. every year. Many people Americans use 500,000 pounds of popcorn it like to put salt and melted butter on their popcorn. Some people eat without salt or butter. Either way- Americans love their popcorn!