- (2006-04-20 00:56:52)01 The Language of Music
- (2006-04-20 00:56:52)02 Schooling and Education
- (2006-04-20 00:56:50)03 The Definition of "Price"
- (2006-04-20 00:56:50)04 Electricity
- (2006-04-20 00:56:47)05 The Beginning of Drama
- (2006-04-20 00:56:47)06 Television
- (2006-04-20 00:56:45)07 Andrew Carnegie
- (2006-04-20 00:56:45)08 American Revolution
- (2006-04-20 00:56:42)09 Suburbanization
- (2006-04-20 00:56:42)10 Types of Speech
- (2006-04-20 00:56:39)11 Archaeology
- (2006-04-20 00:56:39)12 Museums
- (2006-04-20 00:56:35)13 Skyscrapers and Environment
- (2006-04-20 00:56:35)14 A Rare Fossil Record
- (2006-04-20 00:56:32)15 The Nobel Academy
- (2006-04-20 00:56:32)16. the war between Britain and France
- (2006-04-20 00:56:29)17.Evolution of sleep
- (2006-04-20 00:56:29)18.Modern American Universities
- (2006-04-20 00:56:25)19.children's numerical skills
- (2006-04-20 00:56:25)20 The Historical Significance of American Revolution
- (2006-04-20 00:56:22)21 The Origin of Sports
- (2006-04-20 00:56:22)22. Collectibles
- (2006-04-20 00:56:19)23 Ford
- (2006-04-20 00:56:19)24．Piano
- (2006-04-20 00:56:15)25. Movie Music
- (2006-04-20 00:56:15)26. International Business and Cross-cultural Communication
- (2006-04-20 00:56:12)27. Scientific Theories
- (2006-04-20 00:56:12)28.Changing Roles of Public Education
- (2006-04-20 00:56:09)29 Telecommuting
- (2006-04-20 00:56:09)30 The origin of Refrigerators
- (2006-04-20 00:56:06)31 British Columbia
- (2006-04-20 00:56:06)32 Botany
- (2006-04-20 00:56:02)33 Plankton浮游生物. / 'plжηktэn; `plжηktэn/
- (2006-04-20 00:56:02)34 Raising Oysters
- (2006-04-20 00:55:59)35.Oil Refining
- (2006-04-20 00:55:59)36.Plate Tectonics and Sea-floor Spreading
- (2006-04-20 00:55:55)37 Icebergs
- (2006-04-20 00:55:55)38 Topaz
- (2006-04-20 00:55:51)39 The Salinity of Ocean Waters
- (2006-04-20 00:55:51)40 Cohesion-tension Theory
- (2006-04-20 00:55:47)41.American black bears
- (2006-04-20 00:55:47)42.Coal-fired power plants
- (2006-04-20 00:55:44)43.Statistics
- (2006-04-20 00:55:44)44.Obtaining Fresh water from icebergs
- (2006-04-20 00:55:40)45.The source of Energy
- (2006-04-20 00:55:40)46.Vision by
- (2006-04-20 00:55:36)47 Folk Cultures
- (2006-04-20 00:55:36)48 Bacteria
- (2006-04-20 00:55:32)49 Sleep
- (2006-04-20 00:55:32)50. Cells and Temperature
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