As my vision widened, I raised my hand to cover it because the light was a little harsh. After a while, the eyes gradually adjust to the light around them. I let my arms hang down and walked forward. He Quan and Teacher Xia Fan followed behind and walked in......

"Where is this?"

The teacher muttered as he looked around excitedly. "We still want to ask!" The sound of our words and footsteps suddenly mingled. "Is the teacher's grandfather such a powerful person?"

Izumi turned his face and asked with an excited expression.

"Who knows......" The moment when they looked at each other, Teacher Xia Fan's expression was a little troubled. Grandpa rarely mentioned his research in front of me. When I was a child, I sneaked to the observatory a few times to play, and every time I was inevitably taught a lesson. ”

She said as she walked forward. After turning left and passing a corner, a telescope appeared in view behind many instruments that could not be named or even seen. Above it, there is a circular skylight, which is exactly at right angles to the telescope.

"Is this for stargazing?"

Izumi ran over and stared curiously. "It should be. Rather, telescopes can do more than just stargazing. It can also see some celestial bodies other than the stars. Teacher Xia Fan explained as he fiddled with the telescope in front of him.

"Teacher, let me take a look!"

Izumi's eyes sparkled, and he walked over and took Xia Fan's hand and said. "Don't worry, it's still adjusting." As she spoke, she bent down again and reassembled the parts stacked at her feet, one by one, on the telescope that now had only one stand.

Although the bracket has rusted near the tip and where the tube is attached, it is not impossible to secure. Just replace the screws at the connection with a new one. Fortunately, there was a bag of unused screws on the low table next to it.

Xia Fan unpacked the package, and after some searching, he took a few undamp ones and put them on, and then re-tightened them. "That's it—" she said, raising her hand to wipe the sweat from her forehead, and took a few steps back to give up the place in front of her to Izumi, who had been waiting for him for a long time.

"Wow...... Wow?! It's amazing! It's so big!? ”

It didn't take long for her to hear her continuous exclamations. "It's noisy...... I looked at her from the side, a little unsure of what kind of expression to put on. This isn't the first time we've met, can you be quiet? ”

When I came back to my senses, I realized that I had accidentally slipped my mouth. "Because this is really powerful!" As a result, she ignored me completely, and the voice of amazement echoed through the room. "Really...... Are you an elementary school student? ”

At this point, Lola approached me and reached out and patted me on the shoulder. "Chihiro, there's something on the wall over there." She showed me the notebook and pointed to the wall in the distance. I looked in the direction she was pointing.

"It's just a normal wall, right?"

I say. "There's nothing strange about it." I muttered as I looked at Lola's face. At this time, she shook her head. The expression seriously negated my opinion. Then he grabbed my sleeve.

"You walk in and have a look."

Then, write down such a request in a notebook. "Is there anything on the wall?" Suddenly, I couldn't help but ask her with an incomprehensible expression. She took me by the hand and led me to the wall. It is covered with moss and creeper-like plants, and there seem to be insects that feed on them. "Nothing strange, right?" As I spoke, with a confused face, I reached out and took a—

"This looks like just a normal bug!" They look the size of a fingernail and are hard to spot without looking closely. "No, you're wrong—" A voice came from near the stairs next to it.

"They're not ordinary."

Instantly, I looked up in amazement and looked at the place where the sound was coming from. "Look at this wall again." As soon as the words fell, the owner of the voice slowly emerged from the shadows. "Aster?" Compared to me, Lola is very happy.

"What's there to be surprised about? I'm just here before you. Shion explained as she approached us. I remember there's only one entrance here, right? Listening to her words, I was even more confused, and I couldn't help but push Lola behind me and ask.

Shion shook her head. "Chihiro, the entrance isn't just the one you find." As soon as the words fell, I was a little depressed. Honestly, a bit of a hit. "And how did you get in?" I sighed, my voice a little weak.

"It's easy, look at it—" she said, holding out her right hand and pointing to the ceiling with a finger. - "There's a water pipe buried around the ceiling, right?" Then she asked again. So what? Don't sell it! ”

Suddenly, I urged her with some irritation. "You're so impatient!" Suddenly, Shion sighed. "In fact, these water pipes are connected all the way to the ground. And it's empty inside, too. And then. And told me in a cold but serious tone.

"Just buried in the grass. And it's just the right size for one person to pass through. Suddenly, her expression became a little smug, as if she was showing off something to me. Through these pipes, that's why I'll be there before you. ”

"Is that so?" Suddenly, with a complicated expression, my eyes widened. "Not finding this only shows that you are not careful enough." Then, she added unceremoniously.

I can't refute it now, because what she said is the truth. "Put it aside, what did you mean when you said I was wrong?" I felt a little embarrassed, so I immediately changed the subject, and at the same time, I looked away from her face with some weakness.

"It's very simple, the bugs you thought were just now have actually been replaced by a part of their bodies." With that, she approached the wall and reached out to grab a bug from the dense moss to show me.

"Replaced?"

I hurriedly walked over, took the worm from her hand, looked at it carefully, turned it belly up, turned it over, and looked at it carefully for a long time. "What's the difference between them?" At this time, I couldn't help but turn my face to the aster next to me. "I really can't see it?"

Confused, I asked. "Lend me down—" Shion held out her hand to me, and I returned the worm to her. Then, she held the bug up in front of me, held its head and tail in both hands, and pulled it lightly—"Wow?! ”

Suddenly, before I could react, I heard a voice coming from behind me. I looked over to the source of the voice—"I see! They're small robots, right? Izumi pushed me aside in high spirits, and then pointed to the insect in Shion's hand and said.

"Yes, that's it."

She nodded, reaching out to wipe the little bit of mercury that had fallen from her clothes. Look at me and say. "They appear to be feeding on moss, but they actually eat moss and other corrosive substances to protect the building."

"Moss or other substances that are harmful to the building are converted into restoration materials that can be used to repair the building." After speaking, Zi Yuan looked at Xia Fan's side, and his expression suddenly became serious. "Is that so? Teacher? ”

"Teacher, did you already know?"

At this time, we were all a little surprised. "Why don't you tell us?" In an instant, we all gathered around her. Dissatisfied with some dissatisfaction...... "It's not that I deliberately hid it from you, I just forgot about it!" After all, I was only about 7 years old at the time......"

Suddenly, she couldn't help but take two steps back and explained in a bit of a panic. - Yes, my grandfather did mention that there were important things in the observatory, but he never told me what the "important things" were. So I just threw it in a corner of my mind as something I didn't need to remember.

As soon as she finished speaking, she felt a little embarrassed and embarrassed, and covered her face with her hand...... "I have something else I want you to see—" After speaking, Shion walked to the corner of the stairs near the wall, turned around and beckoned to us.

So, we followed her upstairs, and walked a little more around the corner to the upper floor of the space. Then turn left and stop in front of the first room in the hallway. Shion pushed open the door and walked in first, and we followed behind and walked in.

The room is carpeted, and near the floor-to-ceiling windows are a desk and chair. — But because of the age, it's mottled and the paint has fallen off. There are three journals on the table. It's big, it's thick. If you want to read them all, it can take a lot of time.

"Grandpa......" Teacher Xia Fan paused for a moment as he put his hand on the cover of the journal, which had been completely yellowed. Then slowly flip them over. At the same time, behind the teacher, I also handed over my body to gravity and also opened a journal......