This Week in Science This Week in SCIENCE By RUTH LEVY GUYER See allHide authors and affiliations Science 28 Jun 1991:Vol. 252, Issue 5014, pp. 1763DOI: 10.1126/science.252.5014.1763 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 252, Issue 501428 June 1991 Table of Contents Print Table of Contents Back Matter (PDF) Ed Board (PDF) Front Matter (PDF)