September, page 71—The late James E. McDonald was not a member of the National Academy of Sciences; he was a member of a panel on atmospheric studies that reported to the National Academy. October 1971—In the article “Physics and social change” by George E. Brown Jr, three paragraphs are transposed from their correct order. The last three paragraphs on page 25, beginning “Many physicists have tried…” and ending on page 26 “So says the Fortune article” should appear on page 23, column 2, between the paragraph ending “…a static knowledge base” and the heading “What can we do about it?”

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