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1.HOW AUTOMOBILES WORK(Part Ⅰ)&By［Jeanne Bendick］ 5

2.HOW AUTOMOBILES WORK(Part Ⅱ) 8

3.THE CAR FACTORY&By［Jeanne Bindick］ 12

4.GRAVITY&By［J.Meyer］ 14

5.THE CHEMIST IN THE STEEL MILL(Part Ⅰ)&By［Ira M.Freeman］ 16

6.THE CHEMIST IN THE STEEL MILL(Part Ⅱ) 19

7.THE CHEMIST IN THE STEEL MILL(Part Ⅲ) 20

8.THE CHEMIST IN THE STEEL MILL(Part Ⅳ) 22

9.CHEMICALS THAT CURE(Part Ⅰ)&By［Ira M.Freeman］ 25

10.CHEMICALS THAT CURE(Part Ⅱ) 27

11.CHEMICALS THAT CURE(Part Ⅲ) 29

12.CHEMICALS THAT CURE(Part Ⅳ) 31

13.FUEL FOR THE HUMAN ENGINE(Part Ⅰ)&By［Ira M.Freeman］ 33

14.FUEL FOR THE HUMAN ENGINE(Part Ⅱ) 35

15.FUEL FOR THE HUMAN ENGINE(Part Ⅲ) 37

16.FUEL FOR THE HUMAN ENGINE(Part Ⅳ) 39

17.FUEL FOR THE HUMAN ENGINE(Part Ⅴ) 42

18.THE CHEMIST BUILDS MOLECULES(Part Ⅰ)&By［Ira M.Freeman］ 44

19.THE CHEMIST BUILDS MOLECULES(Part Ⅱ) 47

20.THE CHEMIST BUILDS MOLECULES(Part Ⅲ) 49

21.THE CHEMIST BUILDS MOLECULES(Part Ⅳ) 51

22.AN EXPERIMENT MORE THAN TWENTY-FIVE HUNDRED YEARS OLD&By［Alfred Morgan］ 52

23.ONE OF THE LAWS OF ELECTRICITY&By［Alfred Morgan］ 54

24.CONDUCTORS AND INSULATORS&By［Alfred Morgan］ 56

25.WHAT IS THE AMPERE?(Part Ⅰ)&By［Aifred Morgan］ 60

26.WHAT IS THE AMPERE?(Part Ⅱ) 63

27.INSIDE THE ATOM(Part Ⅰ)&By［Alfred Morgan］ 65

28.INSIDE THE ATOM(Part Ⅱ) 68

29.INSIDE THE ATOM(Part Ⅲ) 70

30.RIVERS OF ELECTRONS&By［Alfred Morgan］ 73

31.BENEFICIAL USES OF NUCLEAR ENERGY&By［J.C.Hogg］ 76

32.NATURAL RADIOACTIVE ELEMENTS&By［Francis Curtis］ 80

33.ATOMIC FISSION&By［Francis Curtis］ 83

34.DIFFERENT KINDS OF FOODS(Part Ⅰ)&By［Julian Huxley］ 86

35.DIFFERENT KINDS OF FOODS(Part Ⅱ) 89

36.THE USEFULNESS OF PLANTS(Part Ⅰ)&By［Julian Huxley］ 91

37.THE USEFULNESS OF PLANTS(Part Ⅱ) 94

38.THE USEFULNESS OF PLANTS(Part Ⅲ) 96

39.THE USEFULNESS OF PLANTS(Part Ⅳ) 97

40.GERMS OF DISEASES AND STERILIZATION(Part Ⅰ)&By［Julian Huxley］ 101

41.GERMS OF DISEASES AND STERILIZATION(Part Ⅱ) 104