Postprint version. Published in Science, Volume 296, Issue 5577, June 28, 2002, pages 2348-2349. Copyright © 2002 American Association for the Advancement of Science. The definitive version is available at http://dx.doi.org/10.1126/science.1073846.
NOTE: At the time of publication, the author Charles A. Knight was not yet affiliated with Cal Poly.