"Don't be afraid, this is called a train, it can run on its own, you should stand a little farther away." Fang Jing admonished the three of them, in fact, he was afraid that this little locomotive would not be powerful, if there was really a big explosion, it was estimated that several people would suffer.

"Brother Jing, why can this train move on its own? How could he run on his own without horses? Qingque was quite curious about the little train in front of her, and she didn't listen to Fang Jing's words, so she approached the little train and followed, just to see the structure of this thing.

"Qingque, this little train is a miniature version, I rely on this charcoal fire and water to drive this little train, if the fire is gone, naturally it can only stop, he doesn't need any animal power to drive, just like the small experiments I used to teach or do with you, they all need the power of nature, not the power of livestock." Fang Jing had taught a lot of knowledge before, as well as small experiments, of course, including water buoyancy and water vapor.

"Brother Jing, this train is driven by the water vapor when we did a small experiment last time?" Qingque stopped and stared at Fang Jing and asked.

"Yes, Blue Sparrow, is the power of this science endless? Work hard, boy, knowledge is infinite, the power of knowledge is infinite, of course, the more you know, the more you can have a great impact on this country and this society, of course, what you create must be able to be used by the people, in order to be widely promoted and spread, if it is just a plaything for the rich, then you should not study. Fang Jing said a lot to Qingque.

"Brother Jing, what is the use of this train?" Although Qingque was interested in Fang Jing's various experiments, she did not think about practical applications.

"I'm just a miniature version of the train, if it is built into a train the size of a stove room, from Chang'an to Luoyang, laying rails, six hundred miles, it can be reached in five or six hours, and it can also tow a few or a dozen carriages, can you think about it, if you load people or things, how much can it be hauled?"

"If such a track is built in the whole of Datang, in the southeast, northwest and northwest directions, from Chang'an to the southernmost, it will only take three or five days to arrive, and it can also haul people or materials, and there is no need for people to eat and chew, if this is considered a copper coin, can you think about how much it is? Of course, the money to build this track is huge. ”

Fang Jing said word by word to Qingque, completely ignoring what the three people present imagined in their hearts, they didn't need to calculate it at all, they knew that it was a huge data, not to mention that Chen Erlin's woman didn't know much about this, except that Qingque had an approximate value in her heart.

"Brother Jing, this ......" Qingque has been scorched by Fang Jing's words, and there is only one thought in his heart, that is, to learn the knowledge taught by Fang Jing.

After half an hour of burning, the charcoal fire was finally extinguished, the steam gradually began to disperse, and the small train finally stopped, Fang Jing held an iron rod in his left hand and a piece of chalk in his right hand.

After the babies got up from the lunch break, they began to line up to go to the school again, and the green sparrow stared at the little train in three steps, and the other little babies did not see it, so they naturally couldn't understand the state of the green sparrow.

"Brother Qingque, it's time for class, hurry up." Lizhi pulled the green finch and walked in the direction of the school.

"Green Sparrow, don't be left behind, line up, you'll be late for a while." Dachu also helped Lizhi call back the soul of Qingque, which is much more important than the little train.

All afternoon, Qingque couldn't give up, he didn't listen to what Mr. said at all, he was immersed in the little train, he kept thinking about how Fang Jing built this little train, for Fang Jing's knowledge, but more than ever, he was hungry and thirsty.

Fang Jing had been waiting for the locomotive's boiler to cool down at this time, and also drained all the excess boiling water to accelerate the cooling of the boiler, the small train had many places that needed to be repaired, and many places could not reach the perfect state in Fang Jing's heart, in fact, the main reason was that the locomotive would explode, and that would be the end of the calf.

After waiting for the locomotive to cool down, Fang Jing resisted and put it into the house, of course, two locks must have been added, it was not that Fang Jing was stingy, Fang Jing didn't want to dismantle the locomotive that he had worked hard for nearly a month because of the carelessness of the little babies, and the little baby at home would definitely not dismantle it, but Fang Jing was guarding against the green sparrow, and only the green finch was the object he guarded against.

"Jing Wazi, what is this train for?" After Chen Erlin watched Fang Jing busy, he was a little overwhelmed, and wanted to ask Fang Jing, why did he create such a thing?

"Uncle, the little train, for the time being, it's just a small thing for experiments, it is used for classes in the future, there is a lot of knowledge in it, and it needs to be taught to the students, but it hasn't been done yet, let's repair it again when I have time, our family is not going to plant potatoes tomorrow or something, these days are hard for my uncle and aunt." Fang Jing was a little embarrassed, during this time, Chen Erlin and his wife were basically nailed to the ground, but Fang Jing had been busy building his own small train, and he didn't help or anything.

"Jing baby, it's okay, you teach the little babies to bother their minds, we can do the work in the field." Chen Erlin didn't think there was anything, after all, teaching the little babies was the most important thing.

"Uncle, this field has also been turned over, we will get the potato seeds out and cut them into pieces in a while, and the grass ash is ready, right? Then let's get it today. After Fang Jing finished speaking, she went to the miscellaneous house where the potatoes were stored, and took out the basket containing the potatoes.

Potato planting, in the south, is basically cut at the bud bud, cut the piece and have the bud bud of the potato pieces, must be rolled three times in the grass ash, this is also a way to prevent the incision from rotting, when planting potatoes, the bud bud up, the incision down, with some force into the soil, each tree is about 20 centimeters apart, pour some manure in each pit, and then sprinkle with thin soil, or spread some straw or something, you can, regular weeding or management.

Of course, in some places, the potato planting method is a little different, they will plant the whole budding potato, Gu said that this planting method can improve the yield, but for Fang Jing, it is not known, Fang Jing was born in the south in his previous life, and he only knows this planting method, and other methods are not very clear, so he can only cut the bud planting method.

"Jing Wazi, how many potatoes do we plant this year? This potato is a good thing, it can be used as a staple food, and it can also be eaten as a vegetable, can my mother's family let them grow some? Zhang Xiaoxia loves potatoes very much, but she hopes that this kind of food can be planted in her mother's house, at least it can solve the problem of eating.

"Uncle, it's not that I'm stingy, this potato is a new crop, I don't want to flow out for the time being, even if it spreads, this big family will inevitably snatch it, and this potato has not been successfully cultivated yet, and it is too small, slowly cultivate it for a few years and see if it can grow to the size of a fist." In fact, Fang Jing is really not stingy, of course, there is still a little caution in his heart, Fang Jing is afraid that the appearance of this potato will affect the changes in the entire history of the Tang Dynasty, of course, Fang Jing is also worrying, how can a few crops affect the course of history.

Chen Erlin and his wife stopped making a sound, they were busy cutting potatoes, thinking about their own thoughts, maybe they didn't understand Fang Jing's approach, but for the two of them, this was originally a big event, and the appearance of any new crops would become the object of coveting by the scholars and gates, let alone potatoes.

Although at present, this potato is only the size of an egg, but the yield is high, although it has not reached the yield of several thousand catties, but it can also achieve a yield of 1,000 catties per mu, at least a few people in a family, if you plant three or five acres of land, you can also eat enough, but this is the Tang Dynasty, not Fang Jing's previous life.

In the afternoon, the three of them were busy cutting potatoes, talking about some parents' shortcomings, Fang Jing would occasionally say a few words, this year the family will plant nearly several acres of potatoes, and other crops will also be planted on one acre, for peanuts, Fang Jing wants to have a variety of them, these are snacks at home in the future, whether adults or children, everyone loves this peanut.

Although the yield of peanuts is low, and the kernels of peanuts are not very large, it does not affect Fang Jing's love for this peanut, not to mention the little babies in the family.

After being busy all afternoon, the three of them were busy, and after the little babies came back from school, they all helped together, so that Zhang Xiaoxia could go to other tasks, at least it was time to make dinner.

Zhang Xiaoxia is basically a fixed time every day, get up early in the morning, she will cook gruel, or make some soup cakes, after the babies get up and wash, you can eat, and after eating, you can go to the school, but Fang Jing gets up relatively late every day, now there are many houses at home, everyone else lives on the first floor, and only Fang Jing lives on the second floor, in addition to being quieter, it can make Fang Jing have a space to be alone.

"Brother Jing, where is the little train? Are you hiding? "Qingque can't hide anything in his heart, and as soon as he comes back, he looks for the little train everywhere.

"Well, there are some problems that need to be fixed, locked in that house, and after this busy time, I will come back to check and repair them." Fang Jing responded casually to the green sparrow.

"Brother Jing, can you let me take a look? I wanted to see how this little train was made. Qingque heard that Fang Jing said that it was locked up, and she was a little anxious, so she wanted to see the little train immediately.

"Not for the time being, I'll talk about it later, don't think about learning, I'm afraid you'll tear it down for me." Fang Jing didn't dare to show this little guy the little train he had built, but don't let this little guy dismantle a small wooden car that he had worked so hard to build like before, and in the end, it took Fang Jing nearly half an hour to reinstall it, otherwise, it would be scrapped.

"Brother Jing, I promise not to demolish it, absolutely not, you just let me see it." Qingque swore to the sky that he would never dismantle the small train.

"No, it's not good, I'll talk about it when it's repaired later." Fang Jing really didn't dare to show this little guy, and said that if he didn't open it, he wouldn't be able to disassemble it for you in three days.

Qingque was in a hurry, but seeing that Fang Jing disagreed, like a general who had lost a battle, he looked listless and stared at Fang Jing.

Fang Jing didn't pay attention to this little guy, if he really wanted to see this guy's expression, he would definitely be deceived, Fang Jing didn't want to exchange the things he had worked hard for nearly a month for a bunch of parts, and it would be useless to pretend to be pitiful.

"If you want to see it, you can make a model by yourself, or draw a picture by yourself, and do it yourself, when I was in class, I also said that the effect of steam, you are so smart, can't you think of it? If you can't figure it out, you can go to the camp and find someone to figure it out. Fang Jing looked at Qingque's pitiful appearance, and opened her mouth to give him an idea.

"Brother Jing, what do you mean, I can also make it? But I don't have a device to melt iron. After listening to Fang Jing's suggestion, Qingque was happy in her heart, but after thinking about it again, she found that she was also happy in vain.

"Of course you can make it, as long as you listen to my lecture attentively, there is no iron-making furnace, you can write to your uncle in Chang'an, and bring you some people or things, it won't be difficult." Although Fang Jing's idea was not very good, it could also improve Qingque's idea of self-exploration of knowledge.

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