It was already noon after visiting the cement factory. Even if Li Mu was ignorant, he could not let Li Shimin have dinner with Liba in the factory. However, the Hui County Government had a little too late. There was a Sanqing Temple nearby. I cleaned it up and it was still clean, so I chose the place to eat here.

This really caught people off guard. Fortunately, Li Shimin was not spoiled. When the palace was in short supply, he didn't eat much. Li Mu asked Dugu Jiu to have some wild game in the mountains and gave him a barbecue. With the blessing of fennel in the Western Regions, he was very happy to eat.

After dinner, Li Mu asked Li Shimin when he would go back, but Li Shimin glared at him and said, "Why are you in a hurry to drive me away? Tell you that I will not go back today, so I will rest here, and you will stay with me."

Li Mu cursed in his heart, "I'll accompany you, and leave the new secretary who has entered the house without accompanying you, an old man... But he only dared to think about this, and he would never dare to say it." Li Mu agreed to clean the room, burn the fragrance, lay the new seats, and make some refreshments and candied fruits. At this time, these things are really hard to do in this place, but Li Mu can do it, and Li Shimin is not surprised at all. He is used to being extravagant in terms of food, clothing and consumption, and it makes people feel strange if it doesn't."

In fact, Li Mu didn't ask about these trivial matters at all.

But who is so lucky for others? You don’t have to worry about it yourself. The little secretary at home has already arranged it. When there was no little secretary at home, several women in the family rushed to think about him. He just said something when he wanted it, and someone would send it to him.

It can be seen how important it is to have a good woman behind a successful man. Li Mu is not only a virtuous man, but he is really a blessing he has cultivated in his previous life.

...

In the back hall, Li Shimin took a shower, tidyed up, and put on the clothes of ordinary people, making him look more and more approachable.

Li Mu had already made tea and waited. When he saw Li Shimin coming, he was diligently like a eunuch: "Thank you for your hard work, please use tea."

Li Shimin picked up the teacup and took a sip. The best Longjing tea brought the sweet and sweet food, making people linger.

"I used to not like drinking tea, but I like drinking alcohol. But since you made the fried tea, I don't like drinking alcohol now, but I like drinking tea." Li Shimin tickled his mouth and said, "Tea is bitter first and then sweet, and it is like life."

Li Mu was too lazy to talk to Li Shimin about the principles of life. He was eager to coax Li Shimin to fall asleep now, so he could go back to chat with the young secretary. When he heard his words, he just smiled perfunctorily and said nothing.

Li Shimin seemed to see what he was thinking, pointed at him and scolded, "I don't know who gave you the courage to be brave enough to marry Wei Zheng's daughter. If you have such a father-in-law, aren't you afraid that he will join you in the future?"

"Gan?" Li Mu looked like a dead pig was not afraid of boiling water and said, "If I die, his daughter will be a widow. If he can do it, then I will be convinced."

"It turned out to be the idea." Li Shimin smiled, knowing that Li Mu was talking nonsense. He and Wei Zheng were both strong-willed people, and he would definitely not change his original intention just because of an extra layer of relationship.

"Since you came back, I have forgotten to ask you something, Qi - commoner Li You, how is it now? His mother is thinking about him very much."

"Good people," Li Mu listened to the word, and felt it was fresh, but he couldn't bear to cancel Li Shimin, so he said, "He is doing well now, and he works as a librarian in the Literature Museum. He deals with books every day and studies even when he has nothing to do. After all, can you learn literacy? You can't do anything for the time being, but if he is willing to study, the Literature Museum will not lack well-educated people, and may not be able to become talents in the future."

"That's good--" Li Shimin sighed and said, "The prince is disobedient. If he had worked hard like this, how could he have been like this?"

"What are your plans next?" Li Shimin pulled the topic apart and asked, "I heard that you have invented a new thing called honeycomb coal?"

Li Mu thought to himself, you are so well-informed. You have not made this thing for a few days and you have learned the news again, which shows how many eyeliners are placed beside me.

He knew it well, but could not reveal it, and said, "If Your Majesty doesn't say it, I will show it to Your Majesty."

As he spoke, Li Mu stood up and said to Li Shimin: "Your Majesty, please wait a moment, I will make some arrangements."

Li Shimin signaled Li Mu to let go. Li Mu turned around and went out. Not long after, he came back and said to Li Shimin: "Please move your Majesty into the woodshed. I will show you honeycomb coal for your Majesty."

"I'm about to see." Li Shimin got up, and Eunuch Gao brought the fur to Li Shimin, and came to the woodshed with Li Mu.

On the edge of the firewood pile in the firewood, there was a small pile of coal powder, a basin of loess, a basin of lime, and a basin of sawdust. Li Mu directed a Jinyiwei to dig four basins of coal powder with iron shovels, add water, and mix evenly with the lime and loess.

After completing these preparations, he took action himself.

He took a honeycomb coal mold, dipped it in the mold cylinder, and then put it in the mixed coal slurry.

After compacting his hands, Li Mu lifted up the mold and turned it to a clean place to put it down.

Then he pressed the pole with his abdomen and lifted the cylinder with both hands. The honeycomb coal that was the size of a bowl and was made of a large lotus-segmented lotus section.

"good!"

Eunuch Gao is worthy of being an old supporting actor and took the lead and shouted.

Li Shimin frowned and looked at him, saying, "What's the good thing?"

"It looks good..." Eunuch Gao murmured in a low voice. In fact, he didn't understand it yet, and he was used to supporting the role.

"Where is it good?" Li Mu wiped his hands, took over the words and asked with a smile.

"Look at his round hole, it looks like a white lotus root that crushes the mud."

"Your lotus root is black." Li Shimin glanced at him, but Li Mu still wanted to give Eunuch Gao some face and said, "It's a bit like that, so let's call him 'coal lotus root' in your words."

Eunuch Gao laughed and said, "Thank you, Marquis, for helping you."

Li Shimin approached the coal lotus root and asked, "I think you should make this coal lotus root for burning?"

"Well, it's not something to eat." Li Mu smiled bitterly. Isn't this a nonsense?

Li Shimin also discovered his own grammatical problem and said, "What I mean is that burning like this is definitely better than burning it with a loose one, but I can't guess what the benefits are."

"Then please continue to look carefully, and I will solve your doubts."

Li Mu continued to instruct the Jinyiwei to add sawdust to the remaining little coal slurry, then carry the prepared coal cakes to the kitchen and bake them on the stove.

In this way, the coal lotus root can be able to do it quickly, otherwise Li Shimin would definitely not have the patience if he had to wait for several hours.

About half an hour later, Li Mu checked the coal lotus root and saw that the honeycomb coal had been dried.

"Your Majesty, you can continue."

Li Shimin nodded and signaled Li Mu to continue the demonstration.

"In the spirit of scientific experiments, I asked them to prepare three rooms and three charcoal basins."

Li Mu asked someone to bring the charcoal basin to explain to Li Shimin: "These three basins are filled with ordinary loose coal, coal lotus root made of ordinary loose coal, and high-quality Taiyuan coal."

"Yeah." Not only Li Shimin, but everyone who can hear Li Mu's voice wants to see what he is doing.

People are naturally curious, so how can they not be interested in new and unseen scientific experiments?

"Come on, let's light it separately." Li Mu snapped his fingers.

The two Jinyiwei stood up and went to lit the two basins of loose coal. It took them a long time to ignite the coals. It took a long time for smoke to emerge before the open flames came out.

Li Mu only used the turtle of the lamp to lit a piece of coal lotus root.

"It's so easy?" Li Shimin was surprised. In his impression, coal was difficult to ignite. If you want to burn coal, you have to use charcoal to ignite the fire first.

Although he was an emperor who was not a common person, he still had this common sense.

"Because this coal lotus is mixed with sawdust." Li Mu smiled faintly and said, "The other two ordinary coal lotus are not that good. But when this one is in, they will burn together."

"It's amazing." Li Shimin couldn't help but praise.

"Put the charcoal basins into three rooms." The doors and windows were sealed, and Li Mu stood at the doors of the three rooms, not knowing what he was waiting for.

After a while, they were all choked out by the rolling smoke. But the coal smoke was so terrible. As long as the coal stove was lit, the house would be filled with smoke for a while and people could not stay there.

He brought people into the room that burned Taiyuan coal. It was indeed much better here, at least there was no smoke and dust.

"This kind of Taiyuan coal is really good. I heard that many people use it to replace firewood." Li Shimin said down-to-earth: "But it is still a bit choking, so rich people still burn charcoal."

"Yeah." Li Mushen nodded with consent. Although this so-called "Taiyuan Coal" was burning, it would still be choking if you stayed next to you for a long time.

Finally, they entered the house burning honeycomb coal.

Everyone was surprised to find that this coal lotus made of ordinary coal had been burned for so long, but there was neither smoke nor choking...

"How could there be no smoke?"

"Why is there no smoke?!"

"And it's not choking!"

Looking at everyone's shock, Li Muxin said that this formula of honeycomb coal will be used in a large scale in rural areas in 1,200 years. Wouldn't it be easy and pleasant to shock you?

"There is no coal ash yet..." Eunuch Gao wiped the wall, and saw his fingers as smooth as before, and he couldn't help but exclaim.

"I observed it very carefully." Li Mu nodded in approval, and Eunuch Gao said not to dare.

But everyone looked at Li Mu in unison and asked him what was going on?

"Speak it out directly, I'm afraid everyone won't remember it." Li Mu then smiled with his hands behind his back: "Why don't you try to use scientific methods and study it yourself?"

"What is a scientific method?" Li Shimin humbly asked for advice. The longer he had contacted Li Mu, the less he knew...

"It is a method of conducting research under the guidance of the scientific spirit." Li Mu pointed to the fire in the pot and said, "Please observe carefully."

"Take your imagination and find the answer." Li Mu instructed slowly.

"Science respects empirical evidence. Imagination must be based on objective basis, not random guesses."

"Science is dialectical thinking, and we must think and evaluate the facts we see in a whole and essential way."

"Science is not stubborn. We must actively accept empirical conclusions and actively adjust our cognition..."

"Science is tolerant of failure, and believe that truth comes from constant trial and error!"

After a cup of tea.

Li Mu asked with a smile: "What has Your Majesty observed?"

"The color of this fire is different!" Li Shimin said in a certain tone: "It is blue! The fire burned from loose coal is red!"

"The color of charcoal is burning!" Eunuch Gao hurriedly added, then looked at Li Mu with anticipation.

"Yes, I observed it very carefully." Li Mu nodded with a smile to show encouragement.

"The flames burned by the coal lotus root are small and soft, not as fierce as those two charcoal basins." Li Shimin added.

"What else?" Li Mu asked again.

"It's been burning for so long, but the shape has not changed." Eunuch Gao poked the tongs and a piece of red honeycomb coal said: "It's quite strong, no wonder there is no smoke."
To be continued...