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About the Cover


Ruth and Annié Nyström are 93-year-old monozygotic Swedish twins who are participants in "OCTO-Twin," a longitudinal study on genetic and environmental influences on individual differences in aging funded by the National Institute on Aging. The study involves same-sex twins 80 or more years of age and measures a broad array of behavioral variables. The report in this issue focuses on cognitive functioning. See page 1560 and the related Perspective on page 1522. [Collage: Preston Morrighan, also an identical twin]

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Science. ISSN 0036-8075 (print), 1095-9203 (online)