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Since ancient times, people have regarded food as their first priority. Only when they have enough food and clothing can they know honor and disgrace, and only when they are warm and worry-free can they think about economics. In an era when there is not enough food to eat, how can we talk about our country, how can we talk about revenge, how can we talk about letting hundreds of families flourish? In that era, "eating well" was the privilege of the nobility, and food production was a gift from God. No one cherished the land, and no one thought of standardized planting. Everyone just asked for it, and plundered the land endlessly. Until one day, a soul from later generations landed on this land with a feeling of "fullness" and a simple determination to reform. The yellow sand and wind blow, looking at each other and despising the royal power. The locusts rise, the maples fall, and we sit face to face with great aspirations. Since ancient times, geniuses have always gone up, leaving behind mediocre people and farmers with barren land. As everyone knows, the source of civilization is always the loess under our feet. Let us see that he is a teacher-oriented person, supplemented by scientific research theory, and joins hands with people with ambitions to jointly create a future where people can have enough to eat. (I would like to use this book to congratulate Mr. Yuan Longping on his birthday. The old man's hard work in this life will be beneficial to the eternity and benefit hundreds of millions. It can be used for everyone. I hope that the old man can always be safe and sound in the future. That's enough.)

This is not a book that you will feel happy after reading. All the stories in this book will be based on reality and will naturally be bound by reality. You want some salt? Yes, but you must first know the distribution of salt mines, brine preparation, purification and carbonization. It's okay to eat better salt, but you must understand one thing: whether it is sea salt or mineral salt, the salt distributed in nature contains a large amount of metal ion impurities. If you don't want to die, it's best not to boil the sea water and eat it like on TV. You want to take a shower with soap? OK! But you have to understand: without any step of refining, saponification, salting out, washing, and alkali precipitation, you can't make soap that can wash out bubbles. Even if you have a magical "soap loaf" in your hand, I think you probably don't know what kind of treatment it needs to go through to clean the oil stains on your hands from eating, right? The magic weapon of the time traveler - glass? Joke! Do you really think that if you put sand in a pot and heat it, it will turn out to be glass? What about iron removal? What about annealing? What about molding? What's more, under normal circumstances, the flame temperature is only 800 degrees Celsius, and to melt silicate, a high temperature of at least 1,500 degrees is required. The average furnace is only 1,200 degrees. Is it really true that a random person can thoroughly study such a skill that has been honed for thousands of years with just a few twists and turns? So you probably understand what kind of book this is, right? Here, every detail is a matter of life and death. Want to live comfortably? You can only start from scratch! There are no shortcuts! . . . . . . . . . This book was previously called "Ordinary People Want to Live" and is a hard-core Carboniferous Age survival novel.