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CONTENTS 5

1．THE SOLAR SYSTEM 5

2．SHOOTING STARS 7

3．NEWTON AND THE PROBLEM OF GRAVITATION 10

4．TIMBER 14

5．NEW METHODS OF COMPUTATION 16

6．？OUCTION OF STEEL 19

7．INCANDESCENTAND FLUORESCENT LAMPS 21

8．HOW MANY ELEMENTS ARE KNOWN 24

9．THE SIZE AND MOTION OF INVISIBLE PARTICLES 27

10．AUTOMATIC CONTROL IN MINES 30

11．AUTOMATION IN THE U．S．S．R． 33

12．SCIENCE IN ACTION 36

13．TAMING THE DESERT 39

14．NORTHEAST CHINA—HEAVY INDUSTRY BASE 41

15．CHINA’S INDUSTRIAL DEVELOPMENT 46

16．EVERYONE A GEOLOGIST 50

17．CHINA’S WEALTH 54

18．THE TECHNICAL REVOLUTION 60

19．HEAT，STEAM，AND POWER 66

20．THE INTERNAL COMBUSTION ENGINE 71

21．RAILROAD ENGINEERING 75

22．HOW YOU’LL FLY WITHIN 50 YEARS 79

23．AIR-CONDITIONING AND REFRIGERATION 84

24．x-RAYS 88

25．SATELLITES WILL BE USEFUL 94

26．WHAT WILL WE DO WITH THE MOON 98

27．ULTRASONICS AND ULTRASONIC TOOLS 107

28．POWER FROM THE SUN 113

29．NUCLEAR FIRES 118

30．NEW ATOMIC REACTOR AND CYCLOTRON 124

VOCABULARY 129