This article was published on November 3, 1994, in Nature magazine under the title “Unanswered Questions.” The article is reviewed on pages 13-14 of volume 372 of the journal. Several options are provided to access the content, including access through your institution or subscription to the journal. Additional options such as purchasing or renting the article are also available, with prices varying depending on the type of article. You can also download the citation and share it with others. Technical support, copyright, permissions, and comments are provided by the journal.
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