A plan to create the world’s largest online medical encyclopedia was announced recently. Known as Medpedia, the site will be free and available to the public when it launches at the end of this year. Physicians, medical schools, hospitals and health organizations are volunteering to build a comprehensive clearinghouse for information about health, medicine and the body. The goal is to create Web pages with easy-to-understand information on 30,000 diseases, more than 10,000 prescription drugs and thousands of medical procedures. People can get a sneak preview of the site at www.medpedia.com. Participants include the UC Berkeley School of Public Health, Stanford School of Medicine, Harvard Medical School, the National Institutes of Health, the national Centers for Disease Control and Prevention, the Federal Drug Administration and many other organizations. Medpedia is urging qualified doctors, biomedical researchers and clinicians to apply to become content editors at www.medpedia.com.