Encyclopedia**

Why do birds fly? What's the matter with hiccups? Why is the sea blue? Why do fish keep their eyes open when they sleep? Why are big planes afraid of small birds? Why does the sun rise from the east every day? Why does it feel so low on a cloudy day? The world of children is full of curiosity about life and the world. They are eager to solve every doubt in their hearts and become a knowledgeable person. Astronomy, geography, chemistry, physics, biology, science... The rich and colorful content will dazzle you! Opening this encyclopedia is like embarking on a wonderful journey of seeking knowledge. According to the law of step by step, the book connects the complicated knowledge and endless principles with things familiar to children and children, allowing them to gradually enter the ocean of human knowledge from near to far, from outside to inside, from known to unknown. Let your children love knowledge, learning, and exploration, and start by reading this "Encyclopedia"!