Unit 1 Is There Life on Earth？ 1
Unit 2 The Dinner Party 19
Unit 3 Lessons form Jefferson 32
Unit 4 My First Job 55
Unit 5 The Professor and Yo-Yo 72
Unit 6 The Making of a Surgeon 95
Unit 7 There's Only Luck 109
Unit 8 Honesty：Is It Going out of Style？ 123
Unit 9 What Is Intelligence，Anyway？ 147
Unit 10 Profits of Praise 159