Sasuke felt that Naruto made a lot of sense. If someone could control airflow, it really might be possible to fly.
After all, there were shinobi in the Shinobi World who could fly.
And if they could not fly, that only meant their training was not good enough yet.
"Naruto, you train ninjutsu here every day. Don't you also have no time to read books? How dare you criticize me!" Sasuke demanded.
Naruto continued controlling the airflow in his hand without even looking up. "What are Shadow Clones for? Since they can go to school, naturally they can also go to the library. That's where most civilians get their knowledge, Second Young Master Uchiha."
As the son of the Uchiha clan head, Sasuke had abundant educational resources. Whatever he wanted to learn, someone would teach him as long as he asked, and his home was filled with books. Naturally, he had no need to visit a place like the library.
Understanding Naruto's teasing, Sasuke turned red with anger once again.
Not only were his cheeks puffed out, they were also flushed crimson with embarrassment.
Unwilling to let Naruto look down on him as an idiot, Sasuke created a Shadow Clone and sent it racing toward the library. From that day onward, whatever books Naruto read at the library, he would read the same ones.
He believed that this way, his intelligence would eventually surpass Naruto's, and then he could call Naruto an idiot!
Meanwhile, Sasuke himself sat down beside Naruto and asked, "I don't have Wind Release. What should I do if I want to fly?"
Although he firmly believed that he would definitely be smarter than Naruto someday, Naruto was still smarter than him for the time being. So Lord Sasuke could only humbly ask for advice.
Faced with the question, Naruto thought over the physics he had learned and quickly found an answer.
"Have you heard of hot-air balloons?" Naruto asked.
If Sasuke did not even know about those, Naruto did not know how else to give him an example.
"I have. My brother took me to play with one," Sasuke answered. His eyes lit up as he vaguely guessed what Naruto was about to say.
"A hot-air balloon uses high heat to warm the air inside it, making the air within lighter than the air outside and thus generating buoyancy. Since you have Fire Release, perhaps you could try using construct Fire Release Chakra to create a ninjutsu based on a similar principle."
The moment Sasuke heard that, he imagined himself foolishly floating through the air while holding a hot-air balloon.
Comparing that to Naruto's dashing appearance as he controlled the wind and rode the air, Sasuke decisively shook his head and rejected the idea. Then he asked expectantly, "Is there a way for Lightning Release to achieve flight?"
Looking at Sasuke's eager expression, Naruto had no idea what bizarre direction his thoughts had taken in that instant.
Still, he answered the question. "In nature, lightning is related to changes in magnetic fields. Conversely, lightning can also be used to generate magnetic fields, which could then offset the effects of Earth's gravity on yourself.
The Fourth Kazekage of the Hidden Sand Village possessed the Kekkei Genkai Magnet Release, allowing him to control Gold Dust and use it to carry himself through the air. The Third Tsuchikage, Two Scales Onoki, could use the Light-Weight Rock Technique to reduce his own weight and fly.
In principle, they both gained the ability to fly by using Chakra to counteract Earth's gravity.
If you can accomplish something similar with Lightning Release, then naturally you can achieve the same thing. You might even develop Magnet Release and gain a new Kekkei Genkai besides the Sharingan.
But I don't have Lightning Release Chakra. If you want to accomplish this, you can only rely on yourself."
The more Sasuke listened, the brighter his eyes became.
His brother Itachi was praised by their father every day, while no matter what Sasuke did, his father treated it as only natural, as though he were merely an inferior version of his brother. But if he could develop the ability to fly...
Or even develop a new Kekkei Genkai like Magnet Release, something his brother had never comprehended...
Then no matter how strict his father Fugaku was, he would have to regard Sasuke more highly!
At the thought of the wonderful scene where he earned his father's approval, Sasuke felt his motivation surge.
"I've decided! I'll use Lightning Release to develop the ability to fly, maybe even develop a new Kekkei Genkai. So what should I do?" Sasuke stared at Naruto with blazing eyes.
More importantly, he absolutely could not let Naruto leave him far behind!
"First, find a scholar who understands physics, especially electromagnetism, and ask them in detail about the relationship between lightning and magnetic fields. Only then will you know which direction to train in."
After a pause, Naruto added, "Oh, and you need to improve your Chakra control too. That way, once you understand the principles, you'll be able to use them successfully."
"Alright, I'll go learn right away." Sasuke nodded, then dashed back home in a flash.
As for how to improve Chakra control, everyone in his family was a shinobi, so the answer to that problem would not be difficult to find.
But physics was another matter. These shinobi were quite skilled at using certain physical phenomena to kill people, but they were not good at researching the fundamental nature of physics.
Still, Sasuke believed that his all-powerful father and brother would surely be able to help him find a professional scholar who understood electromagnetism!
After Sasuke left, Naruto entered the Sealing Space and pulled the Little Fox, who was watching television, into his arms. Only then did he ask curiously, "Kurama, what did you mean earlier about improving Chakra control?"
Held by Naruto, Kurama twisted his body uncomfortably, but he did not kick Naruto away.
After all, this was something he had promised Naruto in exchange for updating the Video Library.
"Your idea of creating Flight Ninjutsu is quite feasible, but your current attempt to control airflow is very inefficient.
To reach the level where you can fly, you need to control Chakra as easily as moving your own limbs. The Water Walking and Tree Climbing exercises you did before were both training methods for improving Chakra control.
The training where you cut leaves apart is also an advanced method.
And now, you need to continue strengthening this aspect of your training. Your Chakra is Wind Release, so I'll tell you a few relatively simple methods..."
Kurama stopped watching his show and became Teacher Nine, his expression serious as he taught Naruto more than a dozen methods of improving Chakra control, from easy to difficult.
The simplest methods included using Chakra to prune the branches of trees in the forest, peeling fruit with Chakra during daily life, and using Wind Release Chakra in place of a kitchen knife to prepare ingredients for dinner.
The more difficult methods involved using only the nature transformation of his Wind Release Chakra in a single instant to cut through large targets such as trees and waterfalls.
If Naruto trained through each of the methods Teacher Nine had taught him, he should be able to gain the ability to control airflow and fly.
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