This problem-solving orientation means that the teacher must help students harness all the disciplines required to think through and solve a range of problems.

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The key change was the addition of copper strips to the metamaterial that shields an object from incoming light to create a better material, couple with a slight change in its orientation to solve a problem caused by dividing the metamaterial of the cloaking device into quadrants.

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One problem that was evident in the first generation Kindle DX persists in this model: the orientation sensor is a bit nuts.

ENGADGET: Amazon Kindle DX Graphite review