Unit 01 Beautiful Trash
Unit 02 What Is a Geek?
Unit 03 Cheering for Cheerleaders
Unit 04 Solved Mysteries
Unit 05 Technology Rivals
Unit 06 Who Discovered America First?
Unit 07 The Haka, a Maori Tradition
Unit 08 Subway Operators
Unit 09 Theories about the Earth
Unit 10 Western Individuals, Eastern Groups
Unit 11 Lost in Time
Unit 12 Funny Product Names
Unit 13 Getting Away from It All
Unit 14 Sleep and Remember
Unit 15 Here Today, but Not for Much Longer
Unit 16 When One Baby Becomes Two
Unit 17 Human vs. Robot Astronauts
Unit 18 Controversial Cave Paintings
Unit 19 Is Chocolate Good for You?
Unit 20 What Was the Most Important Invention?