The process of puffing grain is a very old one.  The oldest known examples were discovered by archaeologists in New Mexico.  This earliest puffed grain was popcorn, which has been around for at least 4,000 years.  Early popcorn was smaller than what we know today, with a popped piece roughly the diameter of a US penny. Other grains were never really puffed until much more recently.  The next puffed grain to appear was invented in 1901 by Dr. Alexander P. Anderson.  Dr. Anderson experimented with grains of corn starch, exposing them to heat and pressure in test tubes.  He heated these grains in an oven, and later cracked them, which caused them to explode into small puffs.  This was the invention of puffed cereal, which would be introduced to the world at the St. Louis World’s Fair in 1904, billed as “The Eighth Wonder of the World”. Sure, it’s grain—now with air! Since Dr. Anderson’s invention, puffed cereals have become a standard in th...