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    • Reframing America’s role in the world· 6 days ago

      The so-called Age of Trump is also an age of instantly forgotten bestselling books, especially ones purporting to provide the inside scoop on what goes...

    • Observations of Satellite I

      Scientific American· 2 hours ago

      The artificial satellites are man's first venture into experimental celestial mechanics. An account of how the first satellite's orbit was determined, and how our knowledge of this orbit can be applied