Liu Che seemed to be very interested in the appearance of honeycomb coal. Liu Tan was originally a little puzzled as to why Liu Che didn't know what the shape of a honeycomb was.

Later I realized that Liu Che was an emperor. To say he was born with a silver spoon in his mouth was not enough to describe him. Who would show him what a beehive looked like? He just needed honey.

Liu Tan had no choice but to say, "It's not quite the same, but the inside of the honeycomb also has small holes."

Liu Che nodded in understanding and asked, "Why do you have to do this? Can't the original coal burn?"

Liu Tan said: "One of these two is for civilians and uses straw and coal. This can save coal and reduce costs. After all, coal is a non-renewable resource."

"Wait, what do you mean by... non-renewable... resources?" Liu Che interrupted Liu Tan and asked, "What do you mean?"

"Once it's gone, it's gone forever. This is the case with coal, jade, and certain gemstones. Coal took hundreds of millions of years to form. In fact, coal itself was originally trees from billions of years ago."

Liu Ju was shocked: "Billions of years?"

Liu Tan nodded. Liu Che, who was sitting above, was clearly a little unconvinced: "Hundreds of millions of years ago... there was no record of anything."

Liu Tan said seriously, "Because there were no humans at that time, this world was formed bit by bit. First, the environment was formed, and then various creatures were born bit by bit."

Liu Che pondered for a moment and said, "You make it sound as if some ancient immortal god created a world for humans, just so they could survive."

Liu Tan opened his mouth, but finally closed it weakly. Forget it, as long as you like it.

In fact, he could have directly explained to Liu Che the origin of mankind, but that would have had too great an impact on Liu Che's existing three views and would easily have caused problems - either Liu Che would go crazy, or Liu Che would think he was crazy.

However, Liu Che has always been resolute in character, and it can be basically confirmed that only the latter situation will occur.

Liu Tan simply stopped talking. Popular science should be done step by step and not with drastic measures right from the start.

In Liu Che's understanding, coal was also a gift from immortals. As for why no one discovered it for so long... of course it was because they were not destined to have it.

As for immortals, everything depends on chance, even when giving gifts.

Liu Tan watched helplessly as Liu Che turned good popular science into logically self-consistent feudal superstition, and suddenly felt very tired.

Fortunately, Liu Che still had enough interest in coal because coal burned for a longer time and could replace trees. Most importantly, low-grade anthracite should be cheaper than firewood, which was enough to make him happy.

Cheaper coal means more people can use it, which can reduce the number of people who freeze to death in winter.

In cold areas in winter, many people froze to death even in later generations, let alone now.

Why is the North bitterly cold? Because every winter, nearly every county reports numerous deaths from freezing.

In addition to these, there are various other natural disasters. Nowadays, houses may be blown down by a strong wind in winter, and then there are snowstorms.

Snow disasters occur almost every year. Even the amount of snowfall, which is nothing in Liu Tan's eyes, may pose a threat to the lives of many people.

The Han people are small, and after years of war, the financial and population pressures have given Liu Che a headache.

Even though the people who froze to death were just a number in his eyes, he still hoped that the number would decrease.

The way Liu Che looked at the honeycomb coal was no different from the way he admired the sharp sword before.

Liu Tan took advantage of his good mood and said, "Father, there is only one coal mine in the Northern Territory, which is not enough. Even if there is enough for the kilns to make honeycomb coal in my country, it is impossible to supply the entire Han Dynasty."

As Liu Tan spoke, he reported a series of figures. Well, these figures were just the total annual output predicted previously.

According to the current mining and production speeds, even if the Northern Border Kingdom works hard for a year, it can only supply Chang'an City and the entire Northern Border Kingdom at most. It can only support Sili with a little effort, and it will be difficult to produce more than that.

Liu Che frowned after hearing this: "Do you mean to look for more coal mines?"

Liu Tan nodded quickly: "The coal mines are not only state-owned in the North, but also in many other places."

As he spoke, he presented another document. When Liu Che opened it, he found that it was a method for finding coal mines and also included two methods for making honeycomb coal.

Liu Che looked at Liu Tan in surprise: "You just took it out like that?"

Liu Tan looked at him blankly: "Huh?"

If we don’t take it out like this, do we need to package it?

Seeing his brother's silly look, Liu Ju couldn't help but chuckle and said, "This is your cornucopia. If you take it out, others will be able to do the same. Then you won't be able to make any money."

Liu Tan finally reacted and said generously, "It's okay. What's mine is my father's. Besides... I don't make money from this."

Before Liu Che and Liu Qie could say anything, Liu Tan scratched his chin and said, "I also have copper mines, iron mines, broken evil gold mines, and cinnabar mines..."

Liu Che watched him counting his mines on his fingers, and suddenly felt a headache. He quickly waved his hand and said, "Alright, I know."

After saying this, he pretended to be nonchalant and asked, "But the world is so big. Even if we knew how to find it, it would be difficult to find it in the short term. Maybe we won't be able to use it until next year."

Liu Tan became nervous upon hearing this. There was no way out this year. He arrived in the Northern Territory very late and wasted a lot of time on various other mines. It was already cold when he found a coal mine.

Naturally, there is no way to promote it this year. Even the current production can only supply Shuofang City at most, and cannot even cover the entire Shuofang County.

But Liu Tan is thinking about next year, at least to promote it next year.

Now hearing Liu Che say this, his habit of worrying about the world came out again. Even though other places were not his fiefdoms, he was very worried.

What Liu Che said made a lot of sense, especially his method... It's not particularly easy to use. Not all coal mines can be found in this way. This method is only suitable for areas with shallow ore layers, that is, the mine can be found by digging twice. If the mine is buried deep, it needs to be judged by other methods.

Liu Ju frowned slightly and said, "The coal mine is too unfamiliar to everyone. Without a precise location, it would be difficult to find. If it's in a sparsely populated area like the Northern Territory, if it weren't for my brother, I'm afraid it wouldn't be visible to the world."

When Liu Tan heard this, his eyes widened and he said, "No, no, there are some closer, in the mountains... Qi State, there should be some in Qi State and Changyi State!"

Liu Che asked, "Really?"

Liu Tan nodded vigorously. Zaozhuang Coal Mine is quite famous. In fact, there is another coal mine that he remembers very clearly, and that is Kailuan Coal Mine.

It is also a very famous large mine, but now the coal mine belongs to Yan State, and Yan State is too close to Xiongnu. Now the king of Yan State is Liu Dan, and Liu Tan does not trust him a little bit, so he concealed this place for the time being and waited until he was more confident in the future.

Liu Che and Liu Ju exchanged glances, and Liu asked about the specific matters.

In the end, Liu Ju stayed to continue discussing state affairs, while Liu Tan, whose brain was overloaded by the questions and was about to go crazy, was finally released by Emperor Wu of Han out of mercy and allowed to meet Chen Ajiao.

When he came out of Weiyang Palace, Liu Tan felt as if he had been... tricked?

He shook his head and simply stopped thinking about it. These were what he wanted to say anyway. Even if he was tricked into saying something he shouldn't say, there would still be a string in his head that was tense, telling him that he shouldn't say it.

Since he didn't feel there was anything wrong, Liu Tan simply stopped thinking about it and went to meet Chen Ajiao happily.

Chen Ajiao had already had various snacks prepared and waiting on the ground to feed him.

After arriving at the Pepper Room, Liu Tan started eating while having people offer things to Chen Ajiao.

After taking a sip of the hot juice, Liu Tan felt so comfortable that his pores opened up. Then he leaned back and sat there limply, happily explaining his newly discovered gem to Chen Ajiao.

He also prepared a whole piece of tourmaline for Chen Ajiao as an ornament, but it was much smaller than the one Liu Che had.

To be honest, the piece of broken evil gold given to Liu Che was unique in the world. He couldn't find another one even if he was asked to. In the end, he could only do some tricks on the base to make this piece of broken evil gold look about the same size as the one Liu Che had.

However, although the size is not comparable, the color of this piece of evil gold is more beautiful. The interweaving of green and red is an artistic realm that humans cannot achieve.

Chen Ajiao was obviously more interested in the gem and couldn't take her eyes off the beautiful piece of evil gold.

After Chen Ajiao had played enough, Liu Tan had the jewelry delivered to her while he ate.

Liu Tan was like a wealthy man who had suddenly become rich. He matched five single-color jewelry according to the colors he currently owned, as well as several mixed-color jewelry. Among them, a bracelet made of broken evil gold beads of various colors was especially liked by Chen Ajiao, and she put it on on the spot.

While Chen Ajiao was admiring the jewelry, Liu Tan finally ate and drank his fill, which made up for the sugar he had just consumed with Liu Che. He couldn't help but sigh in his heart that a child with a mother is really a treasure.

Chen Ajiao waited until he finished eating before saying, "You kid, you came back just like that, and you brought so many things with you. How much money do you have? Are you living a normal life?"

As a mother, she was heartbroken and of course she started giving her son money. Liu Tan was really a little amused and helpless: "Mother, mother, I am not short of money, really!"

Chen Ajiao doesn’t care whether you are lacking or not, as long as she thinks you are lacking, then you are lacking!

When coming out of the Pepper Room, a sentence popped up in Liu Tan's mind: There is a kind of lack of money that makes your mother think that you are short of money.

Originally, Chen Ajiao wanted Liu Tan to live in the palace, and all the furnishings in his Sui Yu Palace remained the same as before. Chen Ajiao arrogantly did not allow anyone to touch the things in Sui Yu Palace, and only asked people to clean it regularly.

And Liu Che seemed to have acquiesced to the queen's obviously unruly behavior and did not assign a new owner to Sui Yu Palace.

The concubines who had been looking forward to living in Suiyu Palace so as to be closer to Weiyang Palace: ...

Finally, he was released at Liu Tan's insistence.

However, Liu Tan certainly wouldn't reject Chen Ajiao so obviously. The reason he gave was, "I haven't even seen the palace that my mother helped me decorate. Let me go take a look first!"

Chen Ajiao had no choice but to let her son stay for a meal before letting him go.

When Liu Tan came out of the palace, the sun was setting. He glanced at the fiery sunset in the west and wondered whether he should stroll back to the palace.

Anyway, his palace is not far from here, so he might as well walk back to digest the food.

At this moment, Miao Rui came up and said, "Your Highness, the knight sent to find little Kunmi has returned."

Liu Tan paused and asked, "What did Lu Xuan say?"

"Little Kunmi returned with the knights and is currently camping twenty miles outside the city. He said he will see Your Highness tomorrow and then leave."

Liu Tan's eyes widened immediately, and he subconsciously asked, "Isn't there curfew yet?"

Miao Rui responded, and Liu Tan jumped on the horse and galloped away without saying a word.

Miao Rui and Bigo were stunned for a moment. When they came to their senses, their prince was nowhere to be seen.