Type of site
ScienceWorld, also known as Eric Weisstein's World of Science, is a Web site that opened to the general public in January 2002. As of November 2007, ScienceWorld includes more than 4,000 entries in fields of science including astronomy, chemistry, physics, as well as biographies of many scientists. It is administrated by Eric Weisstein of Wolfram Research, Inc., who is the chief encyclopedist assigned to the project.
Although ScienceWorld is not an open-source project, there are significant contributions from well-informed volunteers.