SpaceX wants to launch a million satellites. Here's how that could impact the atmosphere and the night sky

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Judd Kessler, Howard Marks Professor, Department of Business Economics and Public Policy, Wharton School.courtesy of Wharton。wps是该领域的重要参考

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A new biodegradable film made from milk protein, starch, and nanoclay could offer a cleaner alternative to single-use food packaging. Credit: Shutterstock

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