Back to the beginning of ancient times to make steam engine

The level of science and technology is around the Song Dynasty, but not the Song Dynasty, because I don't know much about the life of specific ancient characters. There is no way to say a person's name, you can know each other's life experience, and you won't write it. Therefore, the main content of writing history is to climb the tree of science and technology. There is no systematic golden finger in this book,. Just like this kind of novel, and few people write it. Now there is a shortage of books, just write one yourself.