Interesting piece on how cornflakes was made by two brothers
The two Kellogg brothers, Dr. John Harvey Kellogg and his younger brother (and former broom salesman) Will Keith Kellogg worked at Battle Creek Sanitarium in Michigan, where John was physician-in-chief.
Both were strict Seventh-Day Adventists, who used their work at the sanitarium to promote the austere dietary and moralist principles of their religion (including strict vegetarianism and a lifelong restraint from excessive sex and alcohol) and to carry out research into nutrition, and the impact of diet on their patients.
It was during one of these experiments in 1894 that, while in the process of making dough from boiled wheat, one of the Kelloggs left the mash to dry for too long and when it came to be rolled out, it splintered into dozens of individual flakes. Curious as to what these flakes tasted, he baked them in the oven and in the process, produced a cereal called Granose. Some later tinkering switched out the wheat for corn, and gave us corn flakes .