When Li Mu came out of the palace, it was already noon. Li Shimin's enthusiasm for hot air balloons is extraordinary, so he has to let Li Mu explain the principle to him. Li Mu had no choice but to speak, starting with Kong Ming lantern, then thermal expansion and contraction, and then to the basic structure and materials of the hot air balloon, etc., and his mouth was dry.

Li Shimin is a good student, he listens carefully, and he is very humble when he asks for advice, but he is a little stupid. But this is not to blame him, although Li Mu has worked very hard to explain some principles of physics in an easy-to-understand manner, but Li Shimin has no foundation in physics after all, and there is no imagination in his mind to cooperate, so his understanding is naturally slower.

Fortunately, the hot air balloon is not complicated. Li Mulian explained with a gesture, which can be regarded as a science popularization for Li Shimin.

Leaving the palace, Li Mu did not rush back, but went straight to the British Mansion. Yesterday, he didn't get a hot air balloon, didn't fly over the British government, and didn't see the scene of Li Siwen's marriage. As his eldest brother, Li Mu was a little reluctant in his heart. Naturally, I want to come to the door today and have a glass of wine.

But what he didn't expect was that Li Mu came to the British Mansion, but he pounced. The porter told him that the family had gotten up early in the morning and had rushed to the valley outside the city.

This matter made a fuss, and Li Mu had no choice but to turn his horse and run outside the city. After a long day, I finally saw the gate of my small courtyard.

On both sides of the road in front of the door, the carriage could no longer stop. The shadows are all people, Li Mu saw it from a distance, and the flowing water seat was set up again, obviously this was yesterday to Li Siwen, and the big and small officials who didn't come in person came to give gifts.

Li Siwen was entertaining him as a guest, and when he saw Li Mu coming back, he threw the wine jug in his hand, pulled out his legs and ran over, shouting as he ran: "Big brother, have you come down from the sky?" How did you go up, take me to fly around! ”

Dugu Jiu followed, his eyes were also burning, although there were no words, but the meaning was already very obvious.

Li Mu got off the horse and said, "Isn't it just flying, it's a trivial matter." Another day, when I'm free, I'll make another hot air balloon and take you all around. ”

"Don't change the day!" Li Siwen hurriedly said: "I'll fly when I have dinner, right?" Where's the carriage? Why didn't you bring it back? ”

"It's burning!" Li Mu walked into the courtyard, and as he walked, he told a few people about the encounter with "Hot Air Balloon No. 1". Li Siwen suddenly regretted and muttered: "I will return to Dingxiang the day after tomorrow, and it seems that I can't fly." ”

Li Mu stopped, frowned, and said, "Leave the day after tomorrow?" In such a hurry? Your Majesty let you go? I went to talk to him, and it was too impersonal! ”

Li Siwen shook his head and said, "Big brother, it's not Your Majesty's intention, it's that I want to leave." ”

"It's been a month since I left Dingxiang, and every grass and tree in that city was built by me with people, although there is no strong enemy nearby, so I don't have to worry about what will happen, but I still think about it. I discussed it with my father-in-law yesterday, and Xiaoyu walked with me. Tomorrow I will accompany her back to the door, buy some more things, and leave the morning after tomorrow. ”

Li Siwen smiled, a little less hippie smile, a lot more sorrowful, his eyes were slightly red: "Big brother, this time I left, the next time we meet, it will be a year later——"

"Not that long." Li Mu waved his hand and said, "After I have a spring season, I will go to Zhangjiaji to pick up your sister-in-law, and I will definitely pass by Dingxiang at that time." It's only half a year at most. As for this hot air balloon, the current technology is not mature, when I study it, I will make a set of sent to you! ”

Li Siwen was immediately happy, and smirked: "That's great, I want to fly in my dreams." ”

Li Mu shook his head helplessly, he didn't know what to say about the Tang people's obsession with "flying to the sky". Perhaps this is the primitive desire of human beings, and without this primitive desire, there would be no such thing as an airplane in more than a year or so.

Li Mu took the younger brothers and toasted a circle of wine, and then returned to the small courtyard and entered Bai Qiaoqiao's room. Li Zhien was also here, and when he saw Li Mu, his face turned red, like a ripe apple, and he didn't dare to look at his eyes. Last night, both of them took off half of their clothes, and the hot air balloon hit the tree, and their cheeks were so ashamed that they thought about it.

didn't see Wang Ou, Li Mu could understand. Just now when he was toasting, he saw Wang Jue, Wang Ou was not there, probably because he was afraid of being seen.

Li Siwen's wife Qin Yu was talking to Bai Qiaoqiao, Li Mu saw a golden lock next to the pillow, and knew that it must be Qin Yu's intention, and couldn't help but be very happy, it seems that this younger brother and sister have chosen the right one, they are handsome, have a prominent family background, and it is even more rare to be delicate and understand human feelings. For Li Siwen, it is an excellent complement. What's more, she still has a lot of kung fu.

After chatting for a while, Li Mu took Li Siwen out again. When I was toasting just now, I didn't see Li Ji and Qin Qiong. After asking the students who helped, they learned that there were rhinos in the valley and went to see the rhinos together.

Li Mu took Li Siwen to find him, Li Ji saw Li Mu and asked about last night's incident, and Li Mu told the cause and effect. While Li Ji breathed a sigh of relief, he was still worried.

There are no outsiders here, and Li Ji doesn't need to be cautious, and said worriedly: "Li Mu, you are still too careless. When I returned to Chang'an, I heard about some of the things you did, and my heart was uneasy. This is also my fault, I, as a father-in-law, am not in Chang'an, and I can't persuade you in time for many things. I want to talk to you in detail in the past few days, but because of Siwen's marriage, it has been delayed, and now that I am free, I have to talk to you about it. ”

Li Mu also had something to tell Li Ji, so he led everyone to the "Dongpo Pavilion" on the eastern slope, which was the pavilion he ordered Gongsun Kang to build on a whim when he was choosing a site. At that time, it was just a joke, but Gongsun Kang's words to him were never implemented without discount, and the "Dongpo Pavilion" on the eastern slope of the mountain was built together with the small courtyard.

The four of them sat down in the pavilion, and Li Ji opened the conversation: "Li Mu, let's talk about one thing at a time." The first wrong thing you did during this time was to have something to do with the king of Hejian County. I told you about the matter of the King of Hejian. This is a person who can't be touched, because he is the only one who makes His Majesty and the Emperor feel sorry in their hearts. ”

In this case, the day before yesterday, Li Ji would not have said it in front of Qin Qiong. But after yesterday, the two have become in-laws. This is an unbreakable covenant, and it is already a grasshopper on a rope, so there are no scruples.

“…… You need to know, Dou Mien, Shengmi hatred. If the emperor can afford to reward the merits of the courtiers, there is naturally no need to worry about anything. But the merits of the king of Hejian County cannot be rewarded, throughout the ages, those who have high merit have not had a good end, and you must know this in your heart. ”

Qin Qiong nodded slightly, obviously agreeing with Li Ji's words. Li Siwen looked confused, he didn't understand this kind of topic at all.