Unit 1 Unsolved Mystery—The Sea 1
Unit 2 Winter Comes to the Animal World 9
Unit 3 Lost over the Atlantic 17
Unit 4 The Star of the Magi 25
Unit 5 Buried Treasure 33
Unit 6 Lady of the Wasteland 42
Unit 7 Eighteenth Century Style 51
Unit 8 The Giants of Easter Island 60
Unit 9 Michigan's Ma rching Dunes 69
Unit 10 V-Day in the Polio War 77
Unit 11 Sputtering African Fuse 86
Unit 12 Two for a Nickel 95
Unit 13 The"Upstart Crow" 105
Unit 14 The Real She rlock Holmes 115
Unit 15 Is Your Judgment Warped? 124
Unit 16 The Truth about Those"Invisible"Ads 133
Unit 17 Edward R.Murrow Reports on B ritain Under Bombs 142
Unit 18 Is a Race of Robots Possible? 152
Unit 19 The War Against Hunger 161
Unit 20 Come Aboa rd an Atomic Sub! 170
Unit 21 Superstitious?Here's Why! 179
Unit 22 The Cloak-and-Dagger Struggle to keep New Cars Secret 187
Unit 23 Jerry Potts,Scout Supreme 196
Unit 24 Danger by Candlelight 205
Unit 25 Strange Money 215
Unit 26 The G reat Chicago Fire 226
Unit 27 1066 A.D.The Norman Conquest 237
Unit 28 Who Knows? 247
Unit 29 The Beginnin9 of the Healing Art 257
Unit 30 What's So Funny? 268