The two of them got drunk here, and Liu Changlu went to sleep.

The two concubines were ready to help Lu Ning to rest, after all, when it was cold, it was likely to catch a cold now.

Unexpectedly, Lu Ning told them.

"It's good for you to go and rest on your own, I'm going to go to the lab to study hydrogen, and you can prepare some sour plum soup for me to sober up."

Furong looked at Lu Ning's drunken eyes, felt a little unbearable, and hurriedly said.

"Husband, even if you want to study something, don't rush this night, you better go and rest, and talk about it tomorrow."

Lu Ning was indeed a little speechless, in fact, he didn't want to have a good rest, but the time Zhu Yuanzhang gave him was too tight.

If you don't race against time, it is estimated that the date of going to the Black Tooth Country will be delayed indefinitely.

The two concubines were also very helpless, so they had to bring him sour plum soup and wanted to accompany him here.

But he also sent him back, Lu Ning still took pity on the people who cherished the jade, and didn't want these two people to stay up all night with him.

After all, beauty sleep is the best cosmetics for women, which is also very practical in Daming.

After two days of clanging and tossing in the laboratory, when Lu Ning came out, he was simply a little unshaven and couldn't look at it.

However, in the past two days, he has gained a lot.

Not only has hydrogen been successfully extracted, but also sealed plastics for the manufacture of hot air balloons.

So, this time he went to the country of Black Tooth to take a hydrogen balloon.

Moreover, there are no problems with the ability of this hydrogen balloon to carry three or four people.

But. Zhu Xiongying wanted to follow him but was rejected by him, this kid is a good material, but he can't always let him follow him in the wind and rain.

It is still good to learn some ways of governing the country in the DPRK and China.

Zhu Yuanzhang saw the hydrogen balloon invented by Lu Ning and asked with a smile.

"Is this balloon any different from the original hot air balloon? You can tell us a good story, you kid, you can always bring some surprises to Daming. ”

Lu Ning replied to Zhu Yuanzhang with a smile.

"If you talk about the principle, this hydrogen balloon is actually the same as the original hot air balloon, but this time it is only necessary to fill it with hydrogen, and there is no need to provide fuel."

As soon as this theory was spoken, whether it was Zhu Yuanzhang or the ministers and princes present, they were all very shocked in their hearts.

This is simply an invention that allowed Daming to develop rapidly, but in Lu Ning's opinion, it seems to be like a commonplace gadget.

Everyone couldn't help but sigh secretly, this His Royal Highness the King of Changning is simply a demon, what else can't he invent?

At this time, Lu Ning and Liu Changlu had already boarded the airship.

Because the motor on the airship is very advanced, and the hydrogen balloon is full of power, it follows the monsoon all the way to the west.

After just over a month, I came to the Black Tooth Country on the other side of the continent.

After coming here, the tribal chiefs here were very enthusiastic when they saw the two of them coming.

Before that, they had already seen the enthusiasm of the Ming fleet, and they were very helpful to others.

The people of the Ming Dynasty and the Black Tooth Country have established a very good foundation for cooperation, and the local natives here will naturally not embarrass Lu Ning and them.

Seeing the appearance of Bruce, the chief of the Black Tooth Country, Lu Ning felt that he must have something on his mind.

So, I asked him with a smile.

"Chief Bruce, although we are meeting for the first time, we can be regarded as friends, if there is anything, just tell me, I will definitely help you."

Chief Bruce also seemed to trust Lu Ning very much, so he sighed and said.

"Your Royal Highness the Venerable Prince of Daming, I really need your help with something, our Black Tooth Country has been disturbed a lot recently, but I can't lead my people to resist, because I can't beat them."

Lu Ning understood that these people who attacked the Black Tooth Country were all those golden-haired and red-haired bandits.

These people also used the banner of exploring the world to build colonies everywhere, and they also drove away the original inhabitants of the people.

In general, there is no sense of peace at all, and it is completely violent.

You reason with him, and he tells you about weapons, so these local residents of the Black Tooth Country have been deeply disturbed, but they can't beat others, so they are naturally extremely annoyed.

Now, after hearing what Chief Bruce said, Lu Ning replied with a smile.

"It's not a big deal at all, I can help you get rid of these robbers, and I have brought a lot of Daming food and advanced supplies for you to use this time."

Chief Bruce bowed deeply to Lu Ning before speaking.

"His Royal Highness the Great Ming Prince, you are really our great benefactor, as long as you help us drive away the robbers, I can promise you anything."

At this time, Lu Ning glanced at Liu Changlu next to him with a smile and said.

"Brother Liu, it is natural for us to come here to help these peace-loving people, I think our Ming people can't suffer, shouldn't we make some requests to His Excellency the Chief."

Liu Changlu glanced at Lu Ning, and said in his heart that this natural profiteer, it is estimated that he should think of some bad ideas.