Barack Obama accepted Nature's invitation to answer 18 science-related questions in writing; John McCain's campaign declined. Here are Obama's answers to additional questions that did not appear in our print magazine. Wherever possible, Nature has noted what McCain has said at other times on these topics.
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Witze, A. US election: Questioning the candidates, part two. Nature (2008). https://doi.org/10.1038/news.2008.1125
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DOI: https://doi.org/10.1038/news.2008.1125
