Li Er assigned the things brought back by the Eight Views Palace to the ministers, let each of them be responsible for a part, and then quietly promoted it in Datang.

As Li Er's most trusted person, the eldest grandson Wuji is of course responsible for the most dangerous work, and it is also the most rigorous. Because if this thing is leaked, maybe the entire Chang'an City will be empty, and the rest of the people can only become ghosts.

So Sun Simiao was recovered, and then asked people to carefully verify it, looking for the sick cows of cowpox, and then finding a large number of cattle to make this cowpox infectious.

All of this took place outside Chang'an City, in a valley on the edge of the Qinling Mountains. The periphery is blocked by a large army, and no one is allowed to enter without Li Er's holy decree or the edict of the eldest grandson Wuji, and there is no forgiveness for trespassers.

And the army was striking iron everywhere, and the entire barracks of the Sixteen Guards of the Tang Dynasty became blacksmith shops, and all those sergeants made temporary cameos as blacksmiths. All of them are playing horseshoe, and there are horseshoe nails.

There were also Gao Shilian, as well as Cui Jin of Qinghe Cui, and Xiao Yu of Lanling Xiao, who were responsible for movable type printing and also conducted various experiments in a brick-burning kiln around Chang'an City.

Movable type printing is easy to say, but it is also time-consuming to find the right font little by little, as well as the firing of movable type from various materials, and the selection of inks.

Although movable type printing is also firing kilns, it is nothing compared to Du Ruhui's Ministry of Industry, and the Ministry of Industry's workshop outside Chang'an City is full of smoke these days, like a fire.

Truckloads of limestone and clay were transported, and then countless craftsmen, as well as the sergeants of Qianniuwei who were transferred, all became stonemasons, because these things had the process of crushing in the requirements given by Li Er, and they immediately let these people pick up sledgehammers and smash stones.

The whole brick kiln was full of the sound of smashing stones, and when a batch was smashed, it was mixed and then fired in the kiln. I don't know the recipe, and I don't know what it looks like, but these people still keep working as ordered.

Although I don't know what these things are used for, the people of the Ministry of Engineering carried out the orders very thoroughly, limestone, clay, and slag, all of which were constantly brought in these days, and then all the things that were burned out were shipped out like ashes.

"Your Majesty...... This is what is fired, a gray powder, I don't know if it fits or not, there are already twenty kinds of compatibility. Du Ruhui accompanied Li Er to inspect at this time.

"This is cement? But how do you use it? Li Er was also puzzled in his heart at this time, the colors were almost the same, some were slightly blacker, some were slightly whiter, all of them were fine powders, and they were completely useless.

"Your Majesty, don't ask the Immortal Chief anymore." Du Ruhui said.

"This ...... All right! This time, Keming went with me. By the way, bring these samples along with you, and verify them on the spot is the best! Li Er said, otherwise you have to let Lu Hanyang run over from Yushan?

At this time, on Yushan, Lu Hanyang was telling a story to the two little Lori: "The ugly duckling crawled out of the duck egg, but it is not yellow fluff like other ducklings, its fur is gray and ugly, and all the little ducklings don't want to play with it......"

"This, Immortal Master, Xiao Wu wants to know if the ugly duckling is a duck? Why is it different from other ducks? Xiao Wu asked.

"Just listen to it, don't interject!" Lu Hanyang doesn't want to spoil the drama, otherwise what is the point of the ugly duckling becoming a white swan after going through pain again and again?

"In the end, the ugly duckling turned into a white swan......" After the story is finished, Lu Hanyang feels that Xiao Wu and Li Lizhen should understand the truth that they should not give up in the face of difficulties, persevere, and will be able to succeed in the end.

"Xiao Wu, now you understand your question just now." Lu Hanyang said to Xiao Wu.

"I see, it turns out that the ugly duckling is a white swan, that's why it's so ugly. It turns out that it is true that beautiful parents give birth to ugly sons! And don't say anything strong, never give up, in fact, the ugly duckling became a white swan mainly because it was originally a white swan! No matter how hard you try, a duck won't turn into a swan, right? "A four-year-old child, do you really think like that?

Xiao Wu's idea made Lu Hanyang almost blurt out the title of bear child directly, that's right, any effort is fake, and having a good father and mother is the real secret of the ugly duckling's success.

But the next sentence of Li Lizhen made Lu Hanyang even more shocked, is this still the quiet Li Liqing?

"Why are swan's eggs laid by mother ducks?" Li Lizhen asked Lu Hanyang.

After this story, Lu Hanyang felt that he could no longer tell fairy tales to these two little girls.

"Qi Qi Immortal Chief, His Majesty the Tang Emperor outside begs to see you!" Yuan Tiangang had already become the chief steward of the Eight Views Palace, and reported to Lu Hanyang at this time.

"Lizhen, your father is here, let's go out and have a look." Lu Hanyang took the opportunity to get out of the apse and was driven crazy by the two little Lori.

Hearing that the emperor was coming, Xiao Wu and Li Lizhen no longer bothered about the matter of the ugly duckling, and followed Lu Hanyang to the main hall in front, at this time, dozens of sergeants outside each carried a handful of cement and placed it in the courtyard.

"Why did the Tang Emperor come today?" Lu Hanyang asked directly, anyway, he is familiar with Li Er, and he doesn't care about those etiquette or anything, plus Li Lizhen's bond, after the last time he untied the knot, Lu Hanyang didn't care even more.

"Immortal Chief, Xiao Ke came here this time, mainly because a lot of cement samples have been fired, but I don't know what it does, please show Immortal Chief." Li Er said.

"Burned out? Then take a look at this seat. "I didn't expect that in just a few days, a lot of cement was burned, and the state machine was really fast.

"Immortal Chief, please, all the samples have been brought, please here!" Du Ruhui led the way in front. When you come to the courtyard, there are twenty loads here, and the ratio of limestone and clay is marked on them.

"It's very easy to experiment with this, get some sand and gravel, and get some water!" Lu Hanyang said.

"No!" Suddenly, a sergeant left, of course these sergeants didn't go after listening to Lu Hanyang's words, but when Lu Hanyang spoke, Li Er had already nodded to them and signaled them to obey the order.

These are all troops that are completely loyal to Li Er, otherwise Li Er would not have taken them out of the palace, although the number is not large, but it is definitely an elite who can defeat a thousand people with one enemy or ten or even hundreds of people.