5- 12 years old, plant a general knowledge tree to learn this set.

I

Our society

By my side

There is a lot of water to drink in the trunk of baobab tree?

Epiphyllum blooms at night to avoid sunlight during the day.

Life tips: a guide to keeping pets

Have you ever observed how zippers work?

With the exploration of scientists for generations, human beings have gradually realized cells.

Simple and vivid examples explain relativity.

The earth is a boiled super egg.

Twenty-four solar terms chart

Look around the world.

How did the top national treasure change from eating meat to eating bamboo?

Tigers and lions rarely meet in nature.

Firemen's duty is not just to put out fires.

There are many different types of police uncles.

How did Aesop, who nobody liked, create a great fable?

Are all the records in China's wonderful book Shan Hai Jing true?

Humans can see that there are 200 billion stars in the universe!

Let's see what people think of alien life.

Thoughts on enriching life

Philosophical speculation that children can understand.