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What if 2+2 really does not equal 4?

Tuesday, the United States Patent and Trademark Office issued Amazon a patent for Amazon’s state of the art system for weighing packages. Apparently the patent covers a method for estimating how much a package should weigh, based upon the estimated combined weights of the books inside, and comparing this to the actual weight of the package. If the weight is outside the estimated range, you look inside and find the problem. Seems difficult to believe there exists no combination of prior art patents that would make this system obvious.

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