| http://www.w3.org/ns/prov#value | - Another embodiment of the invention is directed to a portable, study aid apparatus for use in a system including the portable, study aid apparatus and a printed textbook, the portable, study aid apparatus comprising: a) a housing; b) a processor in the housing; c) an audio device for providing supplemental information associated with the printed textbook to the user in audio form, wherein the audi
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