Cui Xiaoxiao found a clear glass jar (there are quite a few similar things in Weigong's laboratory) and filled it with fragmented finger-sized round stones from the courtyard.

"You see, if it's full of pebbles like this, what happens when I put this in it?"

Cui Xiaoxiao held a palm-sized wooden board in her hand.

"What will happen?"

"What can happen, isn't it just going to be on top?"

"Congratulations, you got it right." The corners of Cui Xiaoxiao's mouth twitched, suppressed the temper she wanted to explode, and then gently placed the wooden board on it.

The planks were firmly grounded on top of a few stones, motionless.

Everyone was stunned for a moment, and then showed disappointed expressions.

"Ah, that's true, isn't it?"

"I thought I could jump into the sky."

“……”

Cui Xiaoxiao couldn't wait to slap them to death at this moment.

"But what happens if I put a piece of iron of the same shape on it?"

She struggled to squeeze out a smile.

"What will happen? Isn't it just a little heavier? ”

"What can happen? Isn't it just a little heavier? ”

Cui Xiaoxiao tried to take a deep breath, then calmed down and put down the iron block that had been cut just now.

As if feeling the weight of the iron, the fine gravel that supported it below began to squeeze down and flow.

The stones on both sides slowly piled up, and finally the lower edge of the iron fell into a section and stopped moving.

Shallow stones buried two millimeters on the lower edge of the iron block.

"Hmm! It seems to have gone in a little! ”

"I've gone in quite a bit!"

"But what does that mean?"

Everyone raised their heads and looked at Cui Xiaoxiao.

Judging by the results, the iron did not sink completely.

If you want to let it sink completely, it is estimated that it will take more than ten years of subtle transformation......

Cui Xiaoxiao was already quite satisfied with the result itself, and she smiled and nodded.

"Well, the same size of iron and the same size of wood, but because of the difference in weight, one of them is trapped and the other is completely exposed. You see, that's what the density does. ”

Cui Xiaoxiao grabbed some smaller iron sand from the side and sprinkled it into the glass container.

Under the witness of everyone's eyes, these fine pieces of iron sand flowed down the gaps between the stones inside.

The sound of the collision of iron sand and stone is like a morning bell, striking the tense nerves in everyone's brains.

The shocked expressions on their faces were quite useful to Cui Xiaoxiao.

"Actually, the water is similar to the stones you see, although you can't see it with the naked eye, but if you zoom in on a drop of water, you will find that there are many of these small round balls together, and there is a certain gap between them. In the case of a denser object, the gap between the small spheres that make up it will be smaller, and the masses will be greater and more closely arranged. This allows them to pass through the gaps in the water and reach the lower layers. ”

Although this method may not be accurate, because the latter phenomenon is more suitable for teaching dissolution, it can make them understand some physical truths.

"That's ...... so"

But a beautiful woman's voice could be heard in the distance.

Everyone looked back, their faces changed drastically, and then they knelt down on one knee.

"Your Majesty."

The woman with a moon-shaped crown and a blue ribbon as bright as the moonlight is none other than the current Sword Rin Sakura, the monarch of the Dream Sword Country.

"Hurry up, please."

She raised her hand flatly, and there was a heart-warming kindness in her majesty.

Cui Xiaoxiao clasped her hands, expressing a trace of dissatisfaction with her uninvited.

"Ah, well, I'm here to find Master Emiya," Kenrin Sakura explained with a smile, "But no one has been reported outside for a long time, but I heard a noise here and came here without permission." ”

Jian Rin Sakura took a few steps forward and cast an approving glance at Cui Xiaoxiao.

"I didn't expect to hear such wonderful content."

Cui Xiaoxiao knew that she would definitely burst into motherly love in the next step, so she came over to touch her face, so she quickly raised her hand to stop her.

"Thanks for the compliment, Auntie."

"Auntie......" The corners of Jian Rin Sakura's mouth twitched.

"Your brother in the palace taught you well." Kenrin Sakura put her hands behind her back and tilted her head sideways with a smile.

"Then, since that's the case, I won't bother you, I still have something to do, so I'll leave first."

"Congratulations to Your Majesty."

The people fell prostrate to the ground.

Kenrin Sakura waved her hand, then walked towards the outer wall.

Originally, I wanted to come to ask Wei Gong for advice, but the content that Cui Xiaoxiao showed just now was like an electric light shooting into her brain.

The recent bizarre fishbone incident has made people fall into a misunderstanding, the seemingly huge sea beast attack case has nothing to do with the fish bones that have been eaten up in the net, but if it is like Cui Xiaoxiao showed, iron can be iron or iron sand, as long as it is separated, it can be drilled into the fishing net.

You have to start smaller.

Kenrin Sakura laughed confidently.

Watching her fly up with a sword and gradually disappear into the sky, Cui Xiaoxiao sighed.

"What a strange woman."

She completely ignored the gazes of everyone around her who were furious like flames at hearing her words.

"Okay, that's all for today, welcome to come back next time." Cui Xiaoxiao clapped her hands, just like in college, and almost shouted to get out of class.

"By the way, little aunt, you haven't explained the relationship between the Styx Lake and the pool we made!"

The little boy didn't give up.

"Oh, I'm going to build a similar pool here, in fact, people can soak in it once in a while, and experience the feeling of being completely stress-free, which is also very good for the body.

It's just that it's easy to get dehydrated, so you can't soak it for a long time. ”

Cui Xiaoxiao nodded with satisfaction, the knowledge imparted today is enough to offset your unpaid labor, right?

"Isn't this levitation?" After some thought and imagination, the little boy suddenly let out an exclamation.

"Uh...... What is your name? ”

"Guo Wei."

"Levitation technique, cheats or moves, it doesn't matter anyway, how many words does it have?"

"It's probably about 300 words."

"Okay, when you go back for me, copy the levitation technique to me a hundred times."

“……”

Cui Xiaoxiao was not ready to continue to entangle with them, so she quickly waved her hand.

"By the way, I can't tell you about this matter, Master."

"Can't you even tell Master?"

"But, isn't that what Master told us to do?"

"Ah, this," Cui Xiaoxiao laughed awkwardly, her brain spinning.

"Although Master asked you to do it, wouldn't it be better to wait for him to find out?" Cui Xiaoxiao raised her head, her big eyes shining, "You think, one is, Master, I've done it." And then when he went to check on the palace, he found that he had done a poor job, and he said, 'Well, it's okay.' The other is that when Emiya came back, he saw your outstanding achievements by chance, and then praised him in amazement, 'Wow, you are really talented to do this without my guidance!' ’”

Cui Xiaoxiao closed her eyes and nodded, and said with a slight smile, "Which one do you think is better?" ”

"Wow, sure enough, being said by the little aunt is really different."

Everyone was brainwashed by Cui Xiaoxiao, and they were immersed in the scene she had just described.

"But," one of the little boys raised his hand weakly and said cautiously, "but these two sentences have nothing to do with the circumstances under which Master sees them, the most important thing is whether the results of our actions are good or bad." ”

"Shut up for me."