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Cool, I’ve always wanted to know how aluminum cans are made, here’s the video for it.
…prominent design feature of beverage cans is that they almost invariably have a slightly tapered top and bottom. Under examination, it is seen that the metal on the lid of the can is significantly thicker than the metal on the sides. This means that a great deal of raw materials can be saved by decreasing the diameter of the lid, without significantly decreasing the structural integrity or capacity of the can…
via wagthis via 
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wow i love vids like this, how are the cans always perfect :S