Why don't Pringles break when they're in that can?
Published in Daily Trivia
The Pringles saddle shape chip surface was modeled after, and can be described mathematically by, a hyperbolic paraboloid, which is a form of quadric. This shape is distinctive in that it is curved at all points along its surface; there are no flat planes or lines. This design characteristic is beneficial as it helps keep the chips from breaking during distribution by eliminating lines of stress along which a small crack may easily propagate. Further it keeps the stack of chips tightly interlocked or nested during distribution. Pringles is the only brand of stacked potato chips that exhibit this characteristic double saddle shape; all others are of a single curve surface design such as a parabolic cylinder or circular cylinder. One of the designers of the machine used to mold Pringles was the science fiction author Gene Wolfe.
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