Unit 1 Twins,Genes,and Environment 1
Unit 2 You Need More Than a Typewriter 10
Unit 3 The"Dream Mile"Becomes Reality 19
Unit 4 Thekas for Ezier Spelling 29
Unit 5 What Do Americans Think? 38
Unit 6 The Awakening of a Continent 48
Unit 7 The Greatest Treasure Hunt 58
Unit 8 Life on Other Planets 70
Unit 9 Why I Love Wisconsin 79
Unit 10 Across the Sea of Stars 88
Unit 11 The Lost Half-Century 97
Unit 12 The Death of a Lone Oak 106
Unit 13 Our First Congresswoman 115
Unit 14 Fortune Is Fickle 126
Unit 15 Your Voice Gives You Away 135
Unit 16 New Babies Are Smarter Than You Think 146
Unit 17 A Killer Is Born 156
Unit 18 Sons of the Sun 166
Unit 19 English for Americans 176
Unit 20 Fashions in Food 188
Unit 21 Who Decides,Readers or Critics 200
Unit 22 The Etruscan Enigma 211
Unit 23 The Purpose of the Republic 221
Unit 24 The Flu:Sure Nuisance,Possible Disaster 233
Unit 25 The Realistic Idealist 244
Unit 26 A Jazz Tradition 256
Unit 27 Da Vinci's Greatest Triumph 267
Unit 28 Modern Man Is Obsolete 279
Unit 29 Flowering of American Music 291
Unit 30 The Struggle for the World 304
Answer Key 316