This Week in Science This Week in Science By Ruth Levy Guyer See allHide authors and affiliations Science 09 Nov 1990:Vol. 250, Issue 4982, pp. 731DOI: 10.1126/science.250.4982.731 Ruth Levy Guyer Find this author on Google Scholar Find this author on PubMed Search for this author on this site Article Info & Metrics eLetters PDF This is a PDF-only article. The first page of the PDF of this article appears above.
Science Vol 250, Issue 498209 November 1990 Table of Contents Print Table of Contents Back Matter (PDF) Ed Board (PDF) Front Matter (PDF)