•    

    references to sites on the World Wide Web. Most of these are uniform resources locators, or URLs; a few are uniform resources names, or URNs. Although the validity of all of these Web addresses was determined at the time of publication, the reader is cautioned that URLs sometimes change, and that one of the shortcomings of the current state of electronic communication is inadequate tracking capability to lead someone from an old to a new URL when the address changes. The replacement of URLs by URNs is a likely solution to this problem in the coming years, but it has not yet happened.

    5.  

    For additional information about the Human Genome Project, see the National Human Genome Research Institute's Web site at <http://www.nhgri.nih.gov/HGP>.

    6.  

    Organization for Economic Co-operation and Development (OECD) Megascience Forum (1993), Megascience and Its Background, OECD, Paris, France.

    7.  

    The inquiry is reprinted in Appendix D, and the results are summarized separately on the USNC/CODATA Web site at <http://www.nas.edu/cpsma/codata.htm>.



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