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Every year nearly a half trillion of these cans are manufacturedthats about 15,000 per second so many that we overlook the cans superb engineering. Lets start with why the can is shaped like it is. Why a cylinder? An engineer might like to make a spherical can: it has the smallest surface area for a given volume and so it uses the least amount of material. And it also has no corners and so no weak points because the pressure in the can uniformly stresses the walls. But a sphere is not practical to manufacture. And, of course, itll roll off the table. Also, when packed as closely as possible only 74% of the total volume is taken up by the product. The other 26% is void space, which goes unused when transporting the cans or in a store display. An engineer could solve this problem by making a cuboid-shaped can. It sits on a table, but its uncomfortable to hold and awkward to drink from. And while easier to manufacture than a sphere, these edges are weak points and require very th