The presidential hopefuls have their say.
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See Editorial, page 1 . Images in full graphic from: K. Lamarque/ Reuters; S. Wenig/AP; C. East/Reuters; A. Wong/Getty; E. Miller/Getty; K. Bleier/AFP/Getty; R. Matay/AP; J. Rinaldi/Reuters; Y. Paskova/Getty; E. Dunard/ AFP/Getty; B. Pugliano/Getty; M. Carlson/AP; J. Sohm/Visions of America/Corbis; M. Stojkovic/SPL; Royalty-Free/Corbis; Lockheed Martin Corp.
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Hand, E. Iowa and after. Nature 451, 4–5 (2008). https://doi.org/10.1038/451004a
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DOI: https://doi.org/10.1038/451004a