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The Perfection of Eggs as Packaging
While I do agree that eggs are great packaging, the fact that it splits right down the axis has more to do with basic physics than design. It's the same as why hotdogs always split long way rather than break in the middle when they swell. The freezing causes an equal pressure inside the shell at every point. The force applied by the pressure is related to the surface area of the plane it's being acted on. The bigger the surface area, the greater the total force. If you imagine the egg as a rectangular prism for simplicity's sake, which each end of the egg being smaller squares. The force applied to the ends is less than the force applied to thesides, since the sides have a larger surface area. The egg shell will split at its weakest point first, and from there the crack will propagate along the greatest force gradient, which will be straight along the axis.
I always enjoy seeing the comparison between fresh and store bought anything.
I think nature is not the designer, but the design!