1．The Water in Our Cities 1
2．Invisible Waves 3
3．From Steam Engines to Diesel Engines 6
4．Choosing a Place for a New Town 8
5．Languages Are Similar and Different 10
6．The Bicycle 12
7．Save the World 15
8．A Story About the Invention of the Wheel 17
9．A Story About the Invention of the Cart（Ⅰ） 21
10．A Story About the Invention of the Cart（Ⅱ） 24
11．Letters of Alphabets and Sounds 27
12．Reading Without Sight 30
13．Curiosity and Science（Ⅰ） 34
14．Curiosity and Science（Ⅱ） 36
15．Edison's First Invention 39
16．Make Science Your Life's Work 42
17．Our Weather（Ⅰ） 44
18．Our Weather（Ⅱ） 46
19．The Evolution of Life 49
20．Worlds in the Sky（Ⅰ） 52
21．Worlds in the Sky（Ⅱ） 55
22．Learning Languages Is Easy—Or Is It? 58
23．The Man Who Dared 61
24．The Computer 64
25．Saucers in the Sky 67
26．Practical Science 69
27．English：The International Language 72
28．Marie Curie，Woman Scientist 75
Glossary 79