Genius is just the threshold for me!

After spending five days traveling back to their hometown, visiting attractions throughout Lezhi County and some of the neighboring counties and cities, Lin Dong and his group prepared to return on the sixth day.

"Grandpa, Grandma, we're going home."

Lin Dong picked up his backpack, took Xu Qingling's suitcase, and said to Lin Chong'an and He Yin.

"Let me know when you arrive."

Lin Chong'an instructed, "Bring your classmates back to play more often during the holidays."

"Understood." Lin Dong nodded.

"Wait a minute! Take these snacks back with you. Grandpa and Grandma have high blood pressure and high blood sugar, they can't eat so many..."

At this moment, He Yin called out and walked over carrying seven transparent gift bags, each containing some snacks and a few common souvenirs.

Li Tao glanced at the bag, confirmed it contained only ordinary items, and politely accepted it with both hands, saying, "Thank you, Grandma."

"Thank you for your hospitality, Grandma." Su Yue accepted the gift with both hands, looking very happy and cheerful.

"Qingyao, Ranran, these are for you, one for each of you." He Yin handed two bags to Huang Qingyao and Xia Ran.

"Thank you, Grandma." Huang Qingyao and Xia Ran accepted the gift with both hands.

"I'll come here often in the future."

He Yin smiled and walked over to Zhang Yihao: "Yihao, Caiping... these are yours."

"Thank you, Grandma."

Now standing at 182cm, Zhang Yihao, the tallest and strongest man in the crowd, quickly accepted the gift bag with both hands. Jiang Caiping, standing next to him, also whispered a greeting and took the gift bag.

"You're so tall! I wish Xiao Dong was this tall too." He Yin looked up at Zhang Yihao's height and praised him with a smile.

"Grandma, with my build, I can only carry bricks," Zhang Yihao said with a smile.

"Study hard, why are you carrying bricks?"

He Yin chuckled, then walked up to Xu Qingling, handed her the last gift bag, and said with a smile, "Lingling, come back to Grandma's house often. If Xiao Dong bullies you, tell Grandma, and I'll beat him up."

"..." Lin Dong rolled his eyes as he listened to these words.

"Grandma, he won't bully me." Xu Qingling noticed the red envelope in her bag, took it, her ears turning slightly red, and said with a smile, "We're going back now. Grandma, you and Grandpa take care of yourselves at home."

"Okay, okay, let Grandma know when we get there." He Yin nodded happily, checked the time, and said, "Let's set off soon, or we'll get to Chengdu too late."

"I'm going back."

Upon hearing this, Lin Dong called everyone to go outside. Qi Jingchuan and the others had already driven over and were waiting on the side.

"I'm going back."

After saying goodbye to Lin Dong's grandparents, Li Tao ran out into the courtyard and shouted, "I can make it back in time for the professional drone competition!"

"Li Tao!" Huang Qingyao called out.

"What's wrong?" Li Tao turned around curiously.

"I'll switch seats with you. Come sit with Lin Dong, otherwise Shiwuyue will say I abandoned her again..." Huang Qingyao teased with a smile, "I can help her carry some snacks."

"Ah! Huang Qingyao, are you trying to die?!"

Su Yue called out and quickly ran over to push Li Tao, saying, "Get in the car, don't pay any attention to this guy."

"Sigh, it turns out that even best friends say one thing and do another." Huang Qingyao shook her head sadly.

"Take your car."

Su Yue turned around and gave Li Tao a disdainful look, then put her luggage away and got into the second car.

"By the way, Ranran, when are you going to report?"

Huang Qingyao ignored him, walked to the first car and put her luggage down, then looked at Xia Ran, who was also putting down her luggage, and asked, "I remember, freshmen have to register early."

"August 15th, then there will be training, military training," Xia Ran replied with a smile.

"So there's still more than a month left?" Xu Qingling asked in surprise.

"Um."

Xia Ran nodded and said with a smile, "I'll go back to my hometown for a month in a couple of days, then come back to report."

"I'm going back to my hometown in a couple of days..."

Huang Qingyao nodded, got into the car and sat down. Looking at Lin Dong, who had followed her and sat in the second row, she immediately called out, "Lin Dong, do you and Qingling want to come to my hometown for a visit?"

"Is there a private car for pick-up and drop-off?" Lin Dong asked casually.

"No." Huang Qingyao paused for a moment. "Are your standards that high?"

"Is there a security team?"

"You need a security team too?" Huang Qingyao's eyes widened.

"There's nothing we can do, Comrade Lin has made it big."

Lin Dong shrugged: "I don't want to become like Wang Rui."

"Isn't this great? I have a girlfriend, I have 1.5 million, and I can even get an honor recorded in my file."

Huang Qingyao exclaimed, but quickly tossed over a bag of sunflower seeds, looking disgusted, and said, "Forget it, you'd better not come... We don't have a security team, we can't afford to entertain you."

Sigrún has taught at the Iceland University of the Arts as a part-time lecturer since and was Dean of the Department of Fine Art from -. In – she held a research position at Reykjavík Art Museum focusing on the role of women in Icelandic art. She studied fine art at the Icelandic College of Arts and Crafts and at Pratt Institute, New York, and holds BA and MA degrees in art history and philosophy from the University of Iceland. Sigrún lives and works in Iceland.

At noon, the convoy returned to the Chengdu Aircraft Industry Group's residential compound. Qi Jingchuan and others helped unload the luggage, said goodbye, and went back to Xingdong Company.

"Qingling, my mom said Aunt Zhou has to work overtime, so she asked you to come over for dinner."

Lin Dong slung his bag over his shoulder and helped Xu Qingling carry her suitcase up the steps: "The meal is ready."

"Okay, sure."

Xu Qingling nodded, said goodbye to Huang Qingyao and the others, took her suitcase, and led Lin Dong inside.

As they entered the elevator lobby on the first floor and waited for the elevator, Xu Qingling suddenly tightened her grip on Lin Dong's hand, turned her head, and called out, "Dongdong."

"What's wrong?" Lin Dong turned around.

"I heard what you and Ranran said while we were camping that night."

Xu Qingling said something, paused for a moment, and then continued, "I knew last October that she probably knew about your situation."

"Oh, so you were hiding it from me?" Lin Dong's eyes widened.

"I just didn't want you to worry..."

Xu Qingling replied with a smile, "I also know that she secretly likes you; things started happening in the first year of junior high."

"How can you be best friends with someone like this?" Lin Dong was speechless.

He paid special attention to Xia Ran when she was in the first year of junior high school. He noticed her classmates at the time, but Xu Qingling was more sensitive to it, and he comforted her a few times.

But when he got to the second year of junior high, Xia Ran skipped a grade and went to the third year. They weren't in the same class anymore, but just went to and from school together, so he didn't pay much attention to it...

"I don't have many friends I can really talk to. Ranran is one of the better ones, except for Yaoyao and Yueyue."

Xu Qingling paused for a moment, then gently shook her head. Because they grew up in a classified unit, their lifestyle and awareness of security were somewhat different from their classmates outside, making it difficult for them to have a truly intimate conversation.

Furthermore, given that Lin Dong's situation must be kept strictly confidential, she has even fewer true friends to confide in in this lifetime.

"Qingling..." Lin Dong called softly.

"It's nothing. Yao Yao and Yue Yue are the same in class. It's hard for them to really connect with other people."

Xu Qingling chuckled softly, "So as long as Ranran doesn't show it or have any negative feelings about it, there's nothing to worry about..."

At this point, Xu Qingling paused for a moment, then smiled slyly and said, "Moreover, there are at least 20 in the three years of junior high school."

"What? 20?" Lin Dong was taken aback.

"During your three years of junior high, at least 20 girls in school gave you love letters, and there were about a number of other girls who didn't give you love letters but paid special attention to you. I didn't keep track of the exact number, but there were a lot..."

Xu Qingling chuckled and said, "However, some of them have their own agendas, while others are driven by competitiveness and jealousy after seeing me with you, and want to do something."

"Are there that many?"

Lin Dong was somewhat surprised. Although he had received these love letters, he had simply tossed them aside without ever reading them.

But in his memory, he had also received these love letters in junior high school in his previous life.

However, there were only three or four letters. At that time, he was focused on playing LoL and had no intention of developing any relationships beyond friendship.

This person probably maintained good lifestyle habits from a young age, which improved their height and appearance to a higher level. In addition, their personality and temperament changed, which also changed the number of girls who were attracted to them...

"There are more, if not more. There are still some in Yao Yao's class, but I haven't paid much attention..."

Xu Qingling smiled happily and said, "Who told me to claim the title of the most handsome man in the world first?"

If they all knew you, they would definitely be tempted to come to you... I can't possibly bother and drive them away, or calculate and compare them all.

As long as your attitude towards me remains unchanged, and they don't reveal their true intentions, I'll just do my job well... Aside from your issues, Ranran and I get along quite well in other aspects."

"Xu Qingling, your emotional intelligence has improved!" Lin Dong smiled and gave a thumbs up.

In her past life, she would play cards with him and inquire about whether he had any female classmates or online friends during his high school and college years. Now, he exudes confidence and composure.

Ding-dong-

Just then, the elevator beeped and came down from the upper floor to the first floor.

"The elevator's here, let's go up for lunch..."

Xu Qingling cheered and pulled Lin Dong into the elevator to go up to Lin Dong's home.

"Xiao Dong, Qingling is back?"

As soon as the door opened, a blast of cold air from the air conditioner hit me, and Zhang Xiali's voice came from the kitchen: "Xiao Dong, your godfather just came over and is talking to your dad. Go and take a look."

"it is good."

Lin Dong nodded, changed into slippers, and carried their luggage into the house. Xu Qingling washed her hands and happily called Zhang Xiali into the kitchen to help...

"Xiao Dong, you're back? Look at this..."

Wang Xingguo, sitting in the living room, greeted Lin Dong as he entered, holding a notebook, saying, "The J-20 upgrade project has encountered a bit of a problem."

"What's the problem?"

Lin Dong put his suitcase down, walked over and glanced at it: "DSI supersonic air intake design scheme?"

"Yes, the intake design needs to be completely redesigned to match the parameters of the WS-15 engine, and the replacement with the WS-15 engine will be necessary."

But the aerodynamic design of this air intake is a bit of a bottleneck…

Wang Xingguo scratched his thinning hair and said with a troubled expression, "The thrust of the WS-15 engine is too strong. This is the first time we've ever worked with such a high-thrust air intake..."

This air intake took almost two months to develop, with five different designs, but none of them passed wind tunnel testing.

DSI (Diverterless Supersonic Inlet) is an air intake design used in modern fighter jets, especially stealth fighters.

Unlike a normal engine, which can operate normally as long as the air intake is not blocked and the airflow is unobstructed.

Fighter jet engines, especially high-thrust engines, have very high requirements for intake air quality.

Because airflow has adhesive properties, when a fighter jet flies at high speed, a layer of air adheres to the surface of the fuselage, resulting in low-speed and turbulent characteristics, which is known in the industry as "dirty" air.

If this "dirty" air is sucked into the engine, it can cause a decrease in thrust at best, and at worst, it can cause the engine to stall.

The traditional design used to leave a partition between the air intake and the fuselage to directly expel this layer of dirty air.

However, because the air intake would create a strong radar reflection source, it is not suitable for modern stealth fighters, which eventually led to the development of the DSI air intake design.

By using precisely designed, three-dimensional bulges at the airway opening, resembling clamshells, this portion of low-speed, turbulent, dirty air is directly "plowed" away, thus solving the problem.

However, adding this plow will inevitably cause fluctuations and disturbances in other air intakes, leading to other problems.

Therefore, the aerodynamic design of the DSI intake duct must be extremely demanding, ensuring that dirty air is plowed away while also guaranteeing the fluctuation of other intake air, precisely matching the needs of the engine.

"Godfather, send me the raw data. I'll take a few minutes after I finish eating to take a look at it."

Lin Dong glanced at the data briefly and said with a smile, "This aerodynamic design is quite simple; it's not difficult."

"Pretty simple?"

Wang Xingguo's eyes widened, and he was about to say that they had been doing this for two months...

But the next moment, he thought about how stable this kid's aerodynamic design was at Mach 10 and Mach 16, and he immediately stopped talking and nodded, saying, "Then let's eat first."

However, after saying that, Wang Xingguo seemed to remember something, picked up a file folder from the side, and took out two invitations with photos of Lin Dong and Xu Qingling: "I brought your and Qingling's invitations to the military parade today, I was afraid I would forget if I came later..."

"You arrived so quickly?"

Lin Dong reached out and took the two invitations, glanced at the seating charts, then looked at his own handsome picture and Xu Qingling's beautiful face, and immediately nodded, saying, "Okay, we'll go then."

"Keep your invitation safe so you don't lose it; it's a bit of a hassle to get a replacement."

Wang Xingguo nodded: "We need to go there on September 2nd, your uncle will come and take you there..."