This Week in Science This Week in Science Science 14 Jul 1989:Vol. 245, Issue 4914, pp. 107DOI: 10.1126/science.245.4914.107 Article Info & Metrics eLetters PDF This is a PDF-only article. The first page of the PDF of this article appears above.
Science Vol 245, Issue 491414 July 1989 Table of Contents Print Table of Contents Back Matter (PDF) Ed Board (PDF) Front Matter (PDF)