Contents 1
What Do We Mean When We Speak of a Calorie? 1
Earth Resources Technology Satellite(ERTS) 3
Malaria Is on the Rise Again 8
A New Industry Goes Back to Nature 11
Soil Erosion 17
Li Shih-chen 26
How Did Man First Tell Direction? 34
The Story of a Raindrop 35
Types of Cancer 38
What Is Our Main Source of Energy? 40
Albert Einstein 45