Lesson 1 Napoleon : From Schoolboy to Emperor
Lesson 2 Pompeii : Destroyed, Forgotten ,and Found
Lesson 3 Steve Jobs : A Man with a Vision
Lesson 4 Roller Coasters : The Ups and Downs of How They Work
Lesson 5 Language : How Children Acquire Theirs
Lesson 6
Video Ⅰ Surviving an Avalanche
Video Ⅱ Tristan da Cunha Oil Spill
Lesson 7 Robots : How They Work and Learn to Work
Lesson 8 A Tidal Wave : What Is It? Can We Predict It ?
Lesson 9 Levels of Language : Formal and Informal
Lesson 10 Power : The Kinds of Power People Use and Abuse
Lesson 11 Asian and African Elephants : Similarities and Differences
Lesson 12
Video Ⅰ People, Plants, and Pollinators
Video Ⅱ Free Soloing with Alex Honnold
Lesson 13 Lincoln and Kennedy : Different Times, Similar Destinies
Lesson 14 The Titanic and the Costo Concordio : Tragedies at Sea
Lesson 15 Dinosaurs : Why They Disappeared
Lesson 16 The U.S. Civil War : Why It Happened
Lesson 17 Endangered Species : Why Are They Endangered ?
Lesson 18
Video Ⅰ The Surma Peopte
Video Ⅱ Cowboys in North America