Ever notice the small bulge top and bottom on cans, with the concentric ribs? At cook time they allow a little more bulge. The round can see only what they c

Ever notice the small bulge top and bottom on cans, with the concentric ribs? At cook time they allow a little more bulge. The round can see only what they calle 'hoop stress' = tension only. Cubes would bulge more and fit in boxes better though... https://en.wikipedia.org/wiki/Cylinder_stress https://en.wikipedia.org/wiki/Cylinder_stress