We know that eggs are very delicate and break on the application of a very feeble force.
Now, imagine 64 eggs placed between two sheets of glass(they are placed at equal distances, forming a square, as seen in the image), and are subjected to a downward force of 70 pounds.
It's amazing though that they don't break (the reason why they won't break can be found out by solving this ).
Now, why don't they break?
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The curvature. The shells' curve means that no single shell needs to bear the whole weight, this is called load sharing.
The use curvature can be seen in the man made structures, such as curved dams(As in the figure) or curved bridges(As in the fig.) etc.