Since its origins as a researcher’s tool at CERN in the early 1990s, the World Wide Web has developed into an immense international complex of hyperlinked information. Some of the information available on the WWW simply mirrors that found in existing print publications. Much, however, is to be found nowhere else but (often temporarily) on the WWW. Some of that information, such as the webpages produced during and after the September 11 terrorist attacks, is of significant historical importance; other information, such as that found on medical websites, may be of long-term scientific value. The uniqueness of the information to be found on the medium, combined with.