Popcorn

Popcorn, also known as popping corn, is a type of corn that expands from the kernel and puffs up when heated. Popcorn is able to pop because, like amaranth grain, sorghum, quinoa, and millet, its kernels have a hard moisture-sealed hull and dense starchy innards. When heated, pressure builds within the kernel, and a small explosion (or "pop") is the end result. Some strains of corn are now cultivated specifically as popping corns.