It is really sad that Apple has taken control of this technology and yet has given the public nothing to show for it.
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Aluminum both dents easily and scratches easily. It is a cheap crappy material. That is why it is used in soda cans, but, with a few exceptions, is not commonly used in things that need to be durable.
Yeah... good thing its not used in anything else... like boats, trailers, fuel efficient or electric car bodies, airplanes, or space station modules ...