"Brother Heng, do you think Sister Lizhi and Sister Yuzhang will be gas poisoned? They brought back three coal stoves and some coal balls?" After Yang Heng explained the gas poisoning, the little lady became worried about the two princesses.

"Don't worry, it's not time to use a coal stove. Maybe they will use the coal stove to make the two dishes without salt, but it's only a while. It's impossible to let them light the stove in the room every day in such a hot day." Yang Heng comforted his mother, but he was also a little worried. According to some time travel novels, Li Lizhi had such a disease as a gas, and even Li Er's entire family has hereditary conditions. Don't let the gas get smoked, that's Yang Heng's sin.

…………

"What, the queen is summoned. This guard, I don't know if there is anything to call us brother and sister." "Haha, sorry, I really don't know this. It's just that the news came from the palace that I asked me to invite you two." Yang Heng was a little nervous. Are the two princesses really being smoked by gas? Did the fumigation of the air happen early? I'm nervous, nervous, maybe, I'm the only time traveler who was cut off before he grew up. It's better to run away. No, my father and mother are still there, and I finally lived a good life...

With her uneasiness along the way, Yang Heng and Xiao Niang came to the palace, while Xiao Niang chatted and joked all the way, never stopped. This was the first time she came back after leaving Chang'an. She even thought about seeing which friend and which best friend. You know, Xiao Niang was very popular when she was in Chang'an. She not only followed Yang Heng, but also dated many best friends, but only two princesses appeared in front of Yang Heng, and none of her other girls had appeared in front of Yang Heng.

After entering the palace, Yang Heng felt relieved because he did not see any sad atmosphere. You should know that these two princesses are Li Er's favorite two daughters. Of course, there is also a princess named Li Mingda, who is not born now, who is also Li Er's favorite.

Since there is no sad atmosphere, Yang Heng is safe. Fortunately, he did not do anything excessive. It is ridiculous to think about it. When talking about gas before, he was actually scared by himself.

"Grandma is lucky," Yang Heng was excited after seeing Changsun, and even said the word "The Braided Slave" in later generations. But is this really the word "The Braided Slave"? Yang Heng was also a little confused.

"Jixiang, Jixiang, I said Yang Heng, you kid, why do you have new things every time you see you? What kind of greetings is this Jixiang?" Changsun was a little funny. It was obvious that Yang Heng was a little nervous, but what would make Yang Heng nervous? Naturally, she didn't know that Yang Heng was worried about the coal stove.

"Empress, how are you doing recently? I miss you so much in the countryside." The little girl was a way of greeting, but as she was getting older, how many more could she say such greetings?

"Come on, Xiao Niang, I haven't seen you for a while, and you've grown up and beautiful again." Changsun stepped forward and held Xiao Niang's hand intimately and looked up and down. Maybe she thought in her heart, maybe it would be great to have such a lively and cute daughter next time. Beautiful. Although Yu Zhang is very cute, they are always a bit rigid and restrained. This is the result of Tian Family Education. In fact, anyone likes some harmonious farm life, but can the farm life really be imagined by these noble people? Although Changsun suffered when he was young, such hardship is also a life envied by some farmers.

"Come on, little lady, tell my uncle, I heard you made something to burn in the countryside, and what can I tell my uncle?" This, the temptation came, and the problem came. Yang Heng also knew the reason why Changsun asked them to come. Li Er was afraid of missing something good, so he naturally had to know it as soon as possible.

"Empress, let me tell you this. When the two princesses went there last time, the experiment had not been successful, so the princess did not bring back specific information. Now it is finally successful. Just so, the empress misses the little girl too, so I will report this matter together."

Yang Heng reported it directly, "However, Empress, this is not very successful. First of all, this requires a lot of copper. If you use too much copper, maybe the country will lack coins to use it. Also, now I use glutinous rice soup to mix mud, which increases a lot of costs and is also difficult to popularize. If it is better than the benefits of biogas, it is still not cost-effective. In addition, not everyone can use it well, maybe this thing will become a decoration." This is also true. If you don't know how to use it, it will really become a decoration. Now there are many such decorations around me. The country has given a lot of money, but those who can't use it are not used, but those who can't use it are made, but those who can't use it are made, but they are made but not used, and they become decorations. Naturally, in the Tang Dynasty, maybe Li Er will add some decorations after the order.

"Then, what do you think should be done? What you said is something that is good for all parties." Li Er suddenly walked out of the side. At this time, this matter was no longer something Changsun could solve.

"Your Majesty, I think it's better not to be impatient about this matter. Although this biogas has many benefits, it must be used well. Now I still have some new ideas, which may be able to replace the glutinous rice soup and mud. If this idea is successful, it will greatly reduce the cost of manufacturing the pond. If there are really some wealthy families who want to do it, I can personally give some biogas ponds. There may be solutions to the copper coins. Maybe there will be solutions over time." Yang Heng would not say that copper mines can be found on the sea. It is in that place. If Yang Heng becomes a person, there must be a road before the car arrives at the mountain. Everyone will still be able to solve the problem. It depends on how to solve it.

"Okay, I'm waiting for your solution. However, you can give some wealthy ministers or some other people to do it. It's not that our Tang Dynasty is not enough for copper coins, but that all copper coins are hidden in the hands of these people." Li Er naturally knew that many copper coins were not circulated in the world at this time, so it naturally seemed that there were not enough copper coins.
Chapter completed!