CONTENTS 1
1．Why We Walk in Circles 1
2．Wild Animals face to Face 5
3．Solving the Holdup 10
4．Milk 15
5．Arctic Adventure 20
6．Postmen with Feathers 25
7．Why Study Math? 30
8．Mister Imagination 35
9．A Pound of Butter 40
10．A Hole-in-the-Ground Hobby 45
11．The Whistle Language of La Gomera 50
12．Runaway Train 54
13．Living Light 59
14．How Stanley Found Livingstone 64
15．True Tales of Pirate Treasure 68
16．Horace Greeley 72
17．Johnny Shiloh 77
18．The little People 81
19．Rescue Under the Sea 85
20．Surprises in Ice 89
参考译文 93