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The study of how the properties of matter arise from its structure at all scales and of how processing can be used to modify those properties (often in pursuit of a specific application).

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Orbital sunshade over the poles

Blocking sunlight to an area 5-7 million sq miles, in a shape of a pie, with the center 100,000 sq miles left out. We have the technology to make a fabric of nano-tubes for strength, reflective or sol …
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