Short answers, pulled from the story.
Ferdinand Schumacher began his commercial oatmeal company in 1854 in Akron, Ohio. His German Mills American Oatmeal Company was the nation's first commercial oatmeal manufacturer and used a hand-operated oats grinder to turn grain into a substitute for breakfast pork.
John Harvey Kellogg invented Cornflakes in 1891 while serving as the medical superintendent of the Western Health Reform Institute in Battle Creek, Michigan. This accidental discovery occurred while experimenting with wheat to supplement his sanitarium's strict vegetarian regimen.
Kellogg's Sugar Smacks was introduced in 1953 and contained fifty-six percent sugar by weight. This product marked a dramatic shift in the breakfast cereal industry's focus from health to taste and marketing.
Quaker Oats introduced Puffed Rice and Wheat Berries at the World Fair in 1904. The company used raw grains shot with hot compressed air from tubes to create a product that popped up to many times its original size.
Scotland is known for making porridge with only water and salt due to the freezing winters. Other cultures add creamier substances, but the Scottish people prefer this specific preparation.