What? You're a notorious bandit? What a coincidence, me too!

Haicheng Jiaotong University.

The camphor trees on campus provided ample shade, and sunlight filtered through the gaps in the leaves, falling on a boy wearing a casual jacket.

The boy strolled leisurely through the campus, his eyes subtly scanning the surrounding signs and buildings until he found the Chemistry Department.

"Hello, excuse me."

A boy stopped a girl who was carrying a book and walking by with her head down.

The girl was startled by the sudden question, stopped in her tracks, hugged her book, looked up at the boy.

The boy was tall and strong, with a resolute face and slightly messy hair; he was quite handsome.

The girl blushed slightly: "What did you say?"

"Excuse me, does our chemistry department have a professor whose last name is... Gu?"

The girl blinked. "You mean Gu Yanbai, Professor Gu, right?"

Gu Yanbai?

White?

Upon hearing the name, the boy paused slightly, his eyes narrowed, his smile deepened, and he nodded gently.

"Yes, do you know where he is right now?"

"Oh, then you can go to the lecture hall later."

The girl pointed in a direction, "Professor Gu has a class there this morning."

After saying that, the girl asked again, "Um... which department are you in? I don't think I've seen you in the Chemistry Department before."

"I'm a law student."

The boy smiled and said, "Thank you."

After saying that, he turned and walked in the direction the girl pointed, but after taking only two steps, he turned back and asked, "By the way, where exactly is the lecture hall?"

The girl pursed her lips and said, "I'm fine now, and I was just heading that way anyway. I'll take you there."

"Thank you so much."

…………

In the laboratory.

"Professor Gu, why didn't Liu Sen come today?" a girl asked.

"He had some urgent family matters to attend to and went back to take care of them. He probably won't be back for a few days."

Gu Yanbai's tone was calm, no different from usual, and there was no sign of anything unusual.

"Oh, I see."

The girl responded, "By the way, Professor. There's still one step in the organic synthesis experiment you had me do yesterday that I don't quite understand..."

Gu Yanbai patiently explained, his voice steady and his logic clear, displaying a completely responsible attitude.

After half an hour.

Gu Yanbai took his lesson plan and pushed open the door to the lecture hall.

There were still about twenty students scattered around in the lecture hall, but most of them were sitting in the back row.

Gu Yanbai walked to the front of the classroom, put down his things, and glanced around the classroom.

Suddenly, a look of surprise flashed in his eyes as he looked at the boy in the first row.

You should know that for a long time now, no student has been willing to sit in the front row in his class.

When his gaze fell on the boy, the boy squinted and looked him up and down.

He was a man in his fifties, wearing a slightly blue shirt, with half-white hair and old gold-rimmed glasses perched on his nose. He looked somewhat haggard, but his eyes were calm and steady.

Gu Yanbai nodded slightly to the boy and cleared his throat before speaking.

"Today we'll talk about crystallization processes in organic chemistry."

He opened the slides, and the screen displayed a dense array of chemical equations and crystal structure diagrams.

"We previously discussed common crystallization methods, such as cooling crystallization and evaporation crystallization."

Today, we'll focus on the key points and precautions for recrystallization, as well as the critical factors affecting crystal purity.

As he spoke, he picked up the chalk and wrote the three large characters "recrystallization" on the blackboard, then began to explain in detail:

"Recrystallization is one of the important methods for purifying solid organic compounds. Its principle is based on the different solubilities of the components in a mixture in a certain solvent."

Or their solubility in the same solvent differs at different temperatures, causing them to separate...

Gu Yanbai's lecturing style is dry and his speaking speed is steady, like a precise machine.

The students in the back rows were getting sleepy, and more and more people were slumping over their desks.

The boys in the first row, however, seemed to be listening intently, nodding occasionally.

Gu Yanbai seemed to have noticed the student's focus in the first row, and he lectured with more enthusiasm than usual.

He not only explained the theoretical knowledge in detail, but also combined it with his own experimental cases, and even made explanations on the slides.

"The crystals on the left are of ordinary purity, with uneven crystal particles and many impurities."

On the right are high-purity crystals with uniform particles and high transparency, which is the effect of the optimized recrystallization process.

To obtain high-purity crystals, besides choosing a suitable solvent…”

The boy in the first row squinted slightly and nodded slowly, as if he had really taken it to heart.

Time passed slowly. Gu Yanbai closed his lesson plan, glanced at his watch, and asked calmly, "Does anyone have any questions about today's lesson?"

The audience remained silent; no one responded.

Suddenly, a boy in the first row snapped his fingers, the crisp sound jarring in the quiet classroom.

Gu Yanbai also looked at the boy, his eyes filled with anticipation: "This student, what do you want to say?"

The boy had a calm smile on his face, and his voice was neither too loud nor too soft.

"I have a question for Professor Gu. If I want to make a small explosive that can be detonated upon impact."

It doesn't need to be very powerful; the main thing is to produce a strong white light and a lot of smoke to have a deterrent effect. How should I do that?

The classroom fell silent the moment he asked his question.

All the students were stunned, staring at the boys in the first row with strange looks.

This question is so strange!

The female student who had brought Lin Chang'an to the lecture hall earlier was sitting in the back row, and she was also looking curious.

Why would a law student ask such a strange question?

Gu Yanbai frowned slightly upon hearing this question, but quickly recovered:

"That's an interesting question. However, what you're describing involves the manufacture of dangerous materials, which falls under the category of violations and illegal activities..."

The boy smiled and then asked a second question.

"Then I'll ask another question."

If I want to synthesize high-purity methamphetamine, but I'm stuck at the crystallization step.

No matter how the process is adjusted, high-purity crystals cannot be obtained.

Where do you think the problem might lie? How can it be solved?

Methamphetamine?

The atmosphere in the classroom instantly became heavy.

All the students were stunned, staring at Lin Chang'an with disbelief written all over their faces.

This guy actually asked in class how to synthesize methamphetamine?

The students in the back row could no longer fall asleep, and they all sat up straight, looking curiously at the front.

Gu Yanbai's face was solemn, and his tone was unreadable.

"Young man, do you know what you're saying? Methamphetamine is a drug that is strictly prohibited by the state, and synthesizing drugs is a serious crime!"

"Oh? Then let me ask you another question..."