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In page National Academies of Sciences, Engineering, and Medicine:

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The National Academies attempt to obtain authoritative, objective, and scientifically balanced answers to difficult questions of national importance.[1] Top scientists, engineers, health professionals, and other experts (not limited to those in academies membership) are enlisted to address the scientific and technical aspects of some of society's problems. These experts are volunteers who serve on study committees that are convened to answer specific sets of questions. All committee members serve without pay.[citation needed]