A sweet smile, smooth blonde hair, slightly pursed lips, and half-bared pearl-like teeth. There is a special charm in her blue eyes, with a dreamlike glow, mixed with sparks of pleasure, and a desire to learn.

Through those eyes, it seemed that she could see her pure and sincere heart.

Alice, I'll protect you this time.

Qin Song's heart rippled with emotion, and even the light in his eyes softened: "Thank you, Alice, thank you for your trust." ”

There was no one else around, and Alice rarely showed a shy expression, and whispered: "I don't know how other people feel about you, but when I see you and hear your words, it's like ...... Well, there seems to be a particularly familiar feeling. ”

Yes, I have met countless times in my dreams. The diction, logic, and understanding and elaboration of knowledge all come from the same idea, and it is natural that there will be déjà vu.

"Come, help me dry the magic cotton on the stones outside. The night breeze will speed up the drying process. ”

It was the first time for the two to meet, but there was an inexplicable tacit understanding, Qin Song picked up the magic cotton, and Alice would seriously clean up the stone surface outside, smooth it with a small wooden stick, and everything was as if it had been communicated in advance.

After drying the magic cotton, the night was completely dark, and the twilight completely enveloped the ruins. Qin Song's eyes could penetrate the darkness, but Alice had a lot of difficulty, and there were mostly weeds and gravel under her feet.

"Oops. Alice, who was cautious, staggered as her ankle was entangled in a clump of vines.

"Don't rush, walk slowly. Qin Song smiled and hugged her shoulder: "I'll help you." ”

As he spoke, Qin Song squatted down.

"No, how can this be. It was rude to let the wise man crouch down in front of him, and Alice hurriedly squatted down one step ahead of him, groping for the vines.

"It's okay, Alice. Arrogance and arrogance are primordial evil thoughts, like thorny vines under our feet, which will entangle our hands and feet. Humility and fraternity are noble qualities, and they are the sharp blades that break through the vines. ”

Qin Song helped her tear off the vines and free her feet before she stood up and stretched out her hand: "Alice, hold my hand, my eyes can penetrate the darkness." ”

"Well, thank you, Qin. In the dark, Qin Song's jumping eyes were incomparably bright and bright, Alice pursed her lips and nodded, and put her little hand in his big hand without twisting.

"Be careful with the stones under your feet. ”

"Hmm. ”

"There's a hole here, take a big step. ”

"Okay. ”

Letting Qin Song hold hands, passing through gravel, thorns and vines, Alice looked at the tall figure and felt a warm feeling in her heart.

If when they first met, they were a little reserved, but now, Alice has a new understanding of the wise man.

Humble, wise and approachable.

Returning to the stone house and lighting the candles, Alice looked at the slightly rudimentary furnishings, and secretly made up her mind to inform her friends in her dream to provide some furniture for the wise man.

Qin Song didn't care, cleaned up the box that was used as a table, and put two candles in the corner: "The application of knowledge not only requires the accumulation of time, but also the right tools. ”

"Yes. Alice found a rag and wiped the table: "Knowledge is indeed a wonderful thing, and it is the crystallization of knowledge. ”

"Alice. After everything was cleaned up, Qin Song carried two wooden chairs and placed them in front of the table, and after sitting down with Alice, he said with a smile: "The beginning of everything is often the most difficult, so before I start, I want to ask you a question." ”

"No problem. ”

Alice, who realized that she was going to learn knowledge, immediately cheered up.

"Do you know how to draw a circle?"

"Draw a circle?" Alice frowned, in this era when all knowledge was still in its infancy and difficult to disseminate, Alice's ability to read and write was already precious, and she didn't know anything about geometry.

"Skill?skill?"

Qin Song smiled slightly: "It's a tool." ”

Then Qin Song took a cotton thread, tied a wooden stick at each end, and used one of them as a dot to smoothly draw a circular trajectory on the table.

Alice was stunned for a moment: "It's so simple?"

"Yes!" Qin Song handed the tool to Alice: "It seems simple, but this involves the knowledge of circles. Come on, you can give it a try. ”

"Okay. Imitating Qin Song's movements, Alice skillfully drew a circle, and couldn't help but admire: "This is indeed amazing, two sticks and a cotton thread can draw a circle." ”

Qin Song asked with a smile, "What did you find?"

Alice fiddled with the tools in her hand, observed the circle on the table, contemplated her eyebrows, and suddenly her brows relaxed: "I understand, the trajectory of the circle in the middle is the same as the distance of this point, that is, the distance of the cotton thread." ”

What a smart child, he said the essence of the circle in one sentence.

"The longer the cotton thread, the bigger the circle. Alice's eyebrows raised: "If I put the center stick on the trajectory of the circle for the second time, then the circle drawn again will pass through the center of the first circle." ”

"That's right!" Qin Song sighed in his heart, sure enough, he was right, he was a good seedling for drawing.

"Castles rise from cornerstones, stout trees, from seeds. So, Alice, our first step is to make the most basic tools. The Circle Drawing tool is one of them. ”

"Okay!" Alice was completely captivated by the knowledge.

The swords of the Royal Navy are made of stainless steel, which is considered the best material in the camp. Under Qin Song's guidance, Alice skillfully kneading the softened metal.

Soon, the first geometric tool, the compass, was born, with nibs, hinges, legs and nibs, simple in construction but with unparalleled significance.

The next step is the ruler, which uses the straightened cotton thread as a straight line reference, cuts and trims it with a sword, and folds the cotton thread in half continuously, dividing it into 40 equal parts, and a ruler with a scale of 80 is perfectly manufactured. Then the 80-scale ruler was used as the base plate, and after measurement, 20 scales were added, and the standard 100-equal ruler was born.

Then there is the right-angled triangle, according to the Pythagorean theorem of Hook three, strand four, and string five, the cotton thread is measured with a ruler and marked with a scale, which is also perfectly manufactured.

Compass, ruler, triangle, the three major tools of drawing, all of them are baked.

Looking at the three tools on the table that shimmered with metallic luster and had geometric aesthetics, Alice's eyes radiated a blazing light, and under Qin Song's guidance, she learned a lot of knowledge that sounded simple, but had strict rules.

This is important, and in Alice's handicrafts, the lack of precision has always bothered her. But now, with accurate measurement tools, the problem of accuracy will naturally be raised to a higher level.

The reason why Qin Song imparted this knowledge is because standardization is an important foundation for industrial development.

The potential of ruler drawing is unlimited, and every famous mathematician is a master of ruler drawing, such as Gauss, the mathematical god who made 17 sides, which involves complex mathematical principles and geometric theories.

It's just a pity that there was once a river, called Geometry, that drowned many people, and Qin Song was one of them.

All Qin Song could do was for the master to lead him into the door, and his cultivation depended on the individual. With Lia learning math and Alice studying geometry, the two sisters can help each other, learn from each other, and develop together.

Of course, it is completely hand-made, and the accuracy of cotton thread estimation is still limited. However, when it comes to making some standardized tools, there are almost no problems.

"Qin, is this the charm of knowledge?" Alice fiddled with the drawing tools with love, and her mind began to imagine how to use them to help her provide accuracy.

"It's just the cornerstone of knowledge, Alice. Just like a seed that has just sprouted, in order to grow into a towering tree, it needs countless people to water it with wisdom. ”

"Still. Qin Song smiled: "Even if it is a cornerstone, it has infinite uses." Next, maybe we can start making some simple weapons, such as weapons that can unleash the power of demonic cotton. ”

"Is it okay now?"

It was late at night, and even the candles had been changed twice, but Alice was still in high spirits and full of anticipation.

Qin Song really didn't need to rest, but he still had to return to his body and pay attention to the overall situation, so he had to smile and say, "Alice, learning does make people happy." But you have to combine work and rest, and now it's getting late, maybe the gods are waiting for you in your dreams. ”

"Ah, that's right!" Alice grinned and said, "Qin, what you said makes sense. Then wait for tomorrow. ”

"Uh......" Then Alice noticed that there was only one bed in the stone house, and her face looked very embarrassed, of course, not because she had any strange thoughts, but because she felt a dilemma, she couldn't let the wise man give her the bed, right?

Qin Song saw her thoughts and smiled slightly: "You just rest here, I'm going to stargaze." ”

"Stargazing?"

"Yes, meditating under the light of the stars in the sky will make one's mind completely calm and realize the beauty of knowledge. Qin Song had a forced expression, and stood up: "Sleep is not important to me. ”

"Hmm......" Alice pursed her lips and thought for a moment, and at the same time was a little curious: "Qin, let me accompany you for a while." ”

"Okay. ”