Encyclopedias, like popular science books, have made great contributions to opening our cognition, letting us know that the original world is like this, and giving us new angles and new methods to understand and build the world. Popular science books keep pace with science. Reading a book "Uncovering Space", you will find that the universe itself is full of life and keeps running. Black holes, stars, planets and satellites, all of which are not chaotic, have their own laws. When we look up at the starry sky again, the night sky seems to have lifted its veil but become more mysterious. After reading the Secret of Mechanical Operation, the tiny objects in life become unusual. A small pair of scissors became a wedge and lever. We will learn to see the essence through the phenomenon and look for the principle behind it.