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 Costa Concordia: 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 People VIDEO Ⅱ: Cowboys in North America