This book is an annotated guidebook, arranged by subject matter, of World Wide Web sites for K-12 students. The following chapters are included: (1) Virtual Time Machine (i.e., sites that cover topics in world history); (2) Tour the World (i.e., sites that include information about countries); (3) Outer Space; (4) The Great Outdoors; (5) Aquatic and Marine Life; (6) Animal Kingdom; (7) Science and Industry; (8) Mathematics and Logic; (9) Visual Arts; (10) Performing Arts; (11) Language Arts and Literature; (12) Sports and Leisure; and (13) People You Should Know. (Includes an index.) (MES)