Lesson 24 The past life of the earth 地球上的昔日生命
Lesson 25 The 'Vasa'“瓦萨”号
Lesson 26 Patients and doctors 病人与医生
Lesson 27 The hovercraft 气垫船
Lesson 28 Exploring the sea-floor 海底勘探
Lesson 29 The sculptor speaks 雕塑家的语言
Lesson 30 Galileo reborn 伽利略的复生
Lesson 31 Education教育
Lesson 32 Adolescence 青春期
Lesson 33 The process of ageing 衰老过程
Lesson 34 Trading standards
Lesson 35 Space odyssey 太空探索
Lesson 36 The cost of government 政府的开支
Lesson 37 Water and the traveller水和旅行者
Lesson 38 What every writer wants作家之所需
Lesson 39 Waves海浪
Lesson 40 Training elephants训练大象
Lesson 41 Recording an earthquake记录地震
Lesson 42 Are there strangers in space? 宇宙中有外星人吗？
Lesson 43 Patterns of culture文化的模式
Lesson 44 Of men and galaxies人和星系
Lesson 45 Hobbies业余爱好
Lesson 46 The great escape大逃亡
Lesson 47 Planning a share portfolio规划股份投资
