"It's horrible." Xie Menglu covered her mouth tightly, trying her best not to scream. It's all my fault, I snuck into the classroom and didn't turn on the lights when I knew about it.

The long, narrow figure stood upside down on the window, with its feet at the top and the human head at the bottom. Looking back on her first impression, it was an upside-down figure, and it seemed to be a boy.

I don't know when, fine sweat has already broken out on her forehead, and her heart is pounding. Breathing rapidly, she stared at the ground in front of her like that, hoping that such a terrible thing would disappear sooner.

There are often such scenes in how many horror movies, in the dark early hours of the morning, there is no one in the silent campus, only those homeless, lonely ghosts floating in it. Not only that, many schools used to be a cemetery, and this was their home, but during the day, there were so many people in the school that they were too scared to show their faces. And at night it was different, the school was empty, and of course they occupied.

The more I thought about it, the more scared I became, and all of a sudden, Xie Monroe had the urge to cry. It's useless to be afraid, it only makes you more afraid of the unknown. It is absolutely impossible to make yourself bold in a short period of time. What to do, the only thing that can be done now is a word "drag", and drag time with the fearful thing. As long as you stay up for more than two hours, by six o'clock, students will naturally come to the classroom.

Thinking of this, she inexplicably increased her confidence. It's a pity that I don't have a mobile phone around, and if I have one, I can pass the time by reading online novels.

Forget it, let's memorize my English words. Knowledge is power, and as long as I know enough, those demons and monsters will not be able to get close to me.

As everyone knows, the figure suddenly became smaller, and it was getting smaller very regularly. Not only that, but its color also began to change from black to gray, and finally disappeared altogether.

After a while, Xie Menglu's words were almost memorized. She trembled and poked her head out from under the table, but was surprised to find that there was nothing on the window, could it be that I was dazzled, shouldn't I have seen it just now.

In the corridor outside the classroom, there was a sound of footsteps, and the sound of walking was also very hurried. Coincidentally, Xie Menglu also heard it, and the thing dare was slowly approaching the classroom where I was.

Someone suddenly opened the door, and the wind outside the classroom was gusting, and the pages on the desks were all flying.

"Who?" Xie Menglu shouted tentatively, but what she didn't expect was that the person who came in was actually Cheng Yantie.

"You, why are you here, is it you who knocked on the window just now?"

"Don't mention it, I didn't come home last night, wandering around the campus, and finally it was as if I was knocked unconscious by someone." Cheng Biting Tie didn't dare to lie in the face of the girl, so he had to say 1510: "When I woke up, I was lying in the open space next to the toilet, maybe I had a cold, and my head was still a little dizzy." ”

After seeing that the person who came was a classmate, Xie Menglu also sat with him. The two of them talked like this, and the person who knocked on the window was of course Cheng Biting Tie. He didn't mean anything bad either, because he had a hard time believing that there would be people in the classroom at such a late hour.

Xie Menglu and Cheng Biting Tie, both of them have been attacked to varying degrees, and the person who attacked them was Liu Xianying. She sucked the IQ factor of the two people, so it made sense that they couldn't remember anything.

"And what about the inverted figure I saw just now?" Originally, I didn't want to ask about it, but I felt very curious if I didn't ask, so I simply asked.

"What an upside-down figure." Hearing Xie Menglu say this, the hairs behind Cheng Yantie immediately stood up.

Could it be that there is something else in this school besides the two of us now? What is that mysterious black shadow?

"Ah, I see!" Cheng Biting Tie patted his head and exclaimed, "There was such a problem in junior high school physics, this is an obvious small hole imaging!" ”

"What is aperture imaging and can I eat it?" Cheng Biting Tie saw the cuteness in Xie Menglu's eyes in an instant, the girl was still too naïve.

After the sound of "pop", a chair was kicked to the ground by Cheng Biting, and he also took out a pair of glasses from someone else's desk and put them on.

At first glance, it doesn't look like a learned person, but like a professional in mixed society. But none of that matters, his explanation is the most fascinating.

When it comes to small hole imaging, it goes back a long, long time. About 2,450 years ago, a scholar in China, Mo Zhai (di) (Mozi) and his students, conducted the world's first experiment of forming an inverted image of a small hole, which is recorded in the book "The Book of Ink".

Xie Menglu once thought that great physics experiments were studied by foreigners, but he didn't expect that China's physics experiments could be advanced for so long, which is really amazing.

The lecture continued, and the final conclusion was that light travels in a straight line in the air.

The lecture was over, and Xie Menglu finally gave him a warm applause. In that case, the upside-down figure on the window is actually caused by the imaging of small holes.

"That's smart." Cheng Biting Iron touched her cheek, then quickly withdrew his hand and smiled awkwardly.

The first rays of sunlight in the morning shone in the classroom and reflected Cheng Biting's face. The students on duty were the first to come in, and when they saw this situation, they cleaned up very interestingly, only the two of them were not cleaned, and the other areas had already been cleaned.

Every day, the repetitive mechanized movement has long been a source of boredom for these students. Fortunately, I saw such a different scene this morning, and it could have been used as an after-dinner conversation a long time ago.

"Hey, do you know, I saw Cheng Biting Tie and Xie Menglu sitting together this morning!"

"Yes, yes, I saw that too. If you go to bed after class, you may not be named in class. ”

"That's right, let's go together."

"Who's in the third row in front of you, talking so loudly, is it really like no one in the school?" At this time, the principal came over.

"You two, come out." The majesty of the headmaster is not feared by anyone, and sometimes even he himself is afraid.

The two students were directly punished for cleaning the toilet because they were talking in the morning. It just so happens that they don't want to go to class, so they just sweep it.

Cheng Biting Iron opened his tired eyes and found that Xie Menglu was still beside him.