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Cover: AI@50--We Are Golden, by James Gary, New York, New York. What Do We Know About Knowledge? Send all submissions to AI Magazine, AAAI, 445 Burgess Drive, Menlo Park, CA 94025-3442. Electronic submissions should be submitted using the web-based submissions form. Submissions information is available at aimagazine.org. Although no particular style is required for submissions, electronic submissions must be in PDF form. Authors whose work is accepted for publication, will be required to revise their work to conform reasonably to AI Magazine styles. If an article is accepted for publication, a new electronic copy will also be required. Although AI Ma ga zine generally grants great deference to an author's work the Magazine retains the right to determine the final published form of every article. Calendar items should be posted electronically (at least one month prior to the event or deadline). News items should be sent to the News Editor, AI Magazine, 445 Burgess Drive, Menlo Park, CA 94025-3442. Please do not send news releases via either email or fax, and do not send news releases to any of the other editors. Web-based job postings can be made using the job bank submissions form at aimagazine.org. Replacement copies (for current issue only) are available upon written request and a check for $10.00. Back issues are also available (cost may differ). Send replacement or back order requests to AAAI. Microform copies are available from ProQuest Information and Learning, 300 North Zeeb Road, Ann Arbor, MI 48106.