Broadcasting Science and Technology to Various Dynasties

Chaoyun is a history UP master, and he likes to chat with people about history, especially technology. [About how to make soy products] [Essential skills for time travellers: papermaking, glass and soap] If you want to be rich, build roads first. Discuss the importance of transportation. [Education: Children are the future] [Being a farmer in the morning, ascending to the emperor's hall in the evening - the fairest imperial examination system for selecting officials] …… Kings, ministers and common people who can see the sky in the historical plane:! ! ! Reading guide: 1. Cutting off one's own legs, live broadcasting history, leaning towards technology, interspersed with historical events. 2. Try to use research as much as possible, but the author is not a professional researcher in history. Please do not read this article as a history book! This is just an entertainment piece. If you want to study history, please read professional books! 3. If you have anything you want to see, you can leave a message in the comment area. 4. The above topics are not necessarily written in order, and the content is more than that. Purpose: Science and technology are the primary productive forces