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The National Academies of Sciences, Engineering, and Medicine are private, nonprofit institutions that provide expert advice on some of the most pressing challenges facing the nation and world. Our ...

A new proof about prime numbers illuminates the subtle relationship between addition and multiplication — and raises hopes ... It’s these exceptions that make the problem hard. But since then, the ...

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Meanwhile, problems with its CST-100 Starliner spacecraft resulted in two astronauts being left on the International Space Station. SpaceX’s Crew Dragon vehicle will be used to return them to ...

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