This Week in Science This Week in Science By Ruth Levy Guyer See allHide authors and affiliations Science 12 Oct 1990:Vol. 250, Issue 4978, pp. 187DOI: 10.1126/science.250.4978.187 Ruth Levy GuyerFind 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 497812 October 1990 Table of Contents Print Table of Contents Back Matter (PDF) Ed Board (PDF) Front Matter (PDF)
