This book is divided into two volumes, A and B. Volume A is divided into four parts, and volume B is also divided into four parts. These eight parts are cosmic celestial bodies, earth home, animal kingdom, plant world, machinery and equipment, happy society, gourmet world and human life.

1, Cosmic Celestial Bodies mainly talks about celestial bodies in the universe. Why does the moon have craters? Why does the sun sometimes grow ears? What are the uses of artificial satellites? Why do some nebulae glow? Wait a minute.

2. "Earth Home" mainly talks about the earth. Why is the earth also called the "blue planet"? Why is there day and night? Why does it get dark in late summer? Why is the surface of the earth uneven? Wait a minute.

3. The animal kingdom mainly talks about animals. For example, why are animals the largest group in life? Why should we protect wild animals? Why did dinosaurs become extinct? Why don't animals hibernate and die? Wait a minute.

4. Plant World focuses on plants. Why is the air in the forest so fresh? Why can plants purify the air? Wait a minute.

5. "Mechanical equipment" mainly talks about machines. How does the engine work? Why do planes fly? Is there a train running under the sea? Wait a minute.

6. A happy society mainly talks about social affairs. Why is the Spring Festival the biggest festival in China? Why should I post "Door God" in the New Year? Why do you give lucky money for the New Year? Wait a minute.

The food world mainly focuses on food. How is the crust formed? Why are there minor tunes on soda crackers? Why can pop rock "jump" in his mouth? Wait a minute.

7. "A Life of Man" mainly talks about a life of man. Why did you blow out the candles on your birthday? Why do you clink glasses when drinking? Why is there the custom of saluting?

100,000 Why is a set of popular science books for teenagers edited and published by Children's Publishing House in the early 1960s. The latest edition is the sixth edition, and the editor of the sixth edition is Han Qide. In the past 50 years, this set of books has been published in six editions, and the cumulative circulation has exceeded 1 100 million copies. It is a scientific enlightenment book for several generations of young people in New China, and has become the first brand of original popular science books in China. It has played an active role in spreading knowledge and popularizing science, and has influenced generations of young people to embark on the road of science.