Unit 1 Suspense 1
Unit 2 Communication 16
Unit 3 Medicine 31
Unit 4 Family 46
Unit 5 Population 63
Unit 6 The Open Window 80
Unit 7 Cloning 101
Unit 8 Changing Values 117
Unit 9 Invention 137
Unit 10 The Future 154
Unit 11 Women in the Workplace 169
Unit 12 The Hungry Mind 185
Key to Quizzes 1-12 200