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
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