Why Cheerio's Have Their Famous 'O' Shape! | Mistakes That Made America

Added: 2026-05-22

[00:00:00]Cheerios are shaped like an O because of physics. In the 1930s the cereal aisle was a beige blur of boredom. Corn flakes, wheat flakes, rice puffs.

[00:00:09]General Mills wanted to shake things up so they turned to a new ingredient, oats. But there was a problem. Oats didn't puff like corn or rice. Puffing forms these airy pockets that gives many cereals their crunch and long shelf life. So no puff meant no cereal. So General Mills did something completely crazy. They hired a physicist, Dr. Lester Borchardt. Borchardt and his team built something totally new, a pressure-powered puffing gun that blasted oat dough through intense heat and pressure like breakfast artillery.

[00:00:38]But the machine was too powerful. They tested over 10 shapes, pellets, dumbbells, squares, spheres, even tiny stars, but none of them could make it through the new machine. All of them burned, crumbled, or turned to oat dust until one shape did it, a small simple ring, an O. The pressure cooked evenly, the shape held, and the crunch survived.

[00:01:01]General Mills named its new cereal Cheerios. It hit at the perfect time.

[00:01:05]During World War II shelf-stable foods mattered more than ever. They ended up selling 21 million boxes in their first year alone. Then a trademark dispute with Quaker Oats forced a rename into the iconic brand we know today. The famous O, one of the world's most recognizable cereal shapes, was a happy accident by brilliant physicist.