"Wang Lin, may I try this microscope?"

Xu Yun was startled:

"Miss Li, did you remember all the steps?"

Xiaoli tilted her head, seeming a bit confused herself:

"Not really remembered all of them...just feel like I can reconstruct it."

Xu Yun thought for a moment, scrambled the order of the microscope, and stepped aside:

"Miss Li, would you like to try?"

Xiaoli didn't hesitate much, walked over boldly, and somewhat awkwardly picked up the glass slide.

She murmured to herself while replicating Xu Yun's actions:

"First the slice...adjust the aperture...rotate the coarse focus...then the eyepiece...fine focus...done!"

Xu Yun was immediately surprised to look at this little sprout.

You should know.

Over the past few days.

Within the small class consisting of Xiaoli, Xiaozhao, and Old Su, each person's learning progress varied.

The fastest among them is naturally Old Su.

As a contemporary master with some physics knowledge, Old Su has now learned the concept of acceleration.

He often asks Xu Yun for additional lessons after class, sometimes questioning for several hours.

A few days ago, he even dragged Xu Yun to a small hill outside Bianjing City to conduct Galileo's iron ball experiment.

Among the remaining Xiaozhao and Xiaoli, Xiaoli's progress is noticeably slower than Xiaozhao.

Often, the knowledge that Old Su and Xiaozhao can grasp immediately requires Xiaoli to ponder over two or three times to understand.

After all, this girl is a standard liberal arts student.

Interest is one thing; thinking and acceptance ability are another.

But what surprised Xu Yun was.....

Although Xiaoli is a bit stuck in physics and math, she seems to have some talent in biology?

That's quite interesting...

Of course.

Whether this little sprout can eventually walk the path of biology requires further observation.

After all, this is just a mere reconstruction of microscope steps.

Then Old Su tried his hand as well, and after confirming he had mastered the steps, Xu Yun officially replaced the slice with a cockroach specimen.

The twenty-times magnification of the microscope gives an observation effect similar to the close-up cameras of later generations — interested students can search on certain online platforms. Fifteen to twenty-times cameras cost only a few bucks.

Buying one to attach to a keychain and occasionally observing plants is not a bad idea either.

This magnification may not show cells, but with several folds of enlargement, some organs of the cockroach can be seen very clearly.

"So that's it..."

Looking at the magnified cockroach hind leg, Old Su mused:

"Cockroaches can stand firm on walls because their feet have so many fine hooks.

The hooks catch onto wall protrusions to prevent them from falling off....."

"Not only that."

Beside him, Xu Yun picked up a cockroach egg with a homemade tweezer and addressed Old Su:

"You probably don't know, cockroaches only need to mate once in their lifetime and can continuously reproduce offspring.

Simultaneously, they carry a large number of pathogenic bacteria, and many plagues through history were caused by cockroaches and rats.

Therefore, if possible, cockroaches and rats should be eradicated."

Old Su nodded slightly, keeping this matter in mind.

Although he had retired from official duties, when it comes to disease sources, he wouldn't stand idly by.

After all, across various dynasties, the number of civilians dying from plagues is innumerable.....

In a certain sense.

Plagues drain a nation's vitality and hollow out its foundations.

If what Xu Yun says is true, then...

Cockroaches must be killed!

Then Old Su glanced at Xiaoli, who was observing an ant with apparent keen interest.

He couldn't help but touch the microscope, admiring:

"Microscopic, microscopic, Xiaowang, this device is indeed as miraculous as you said.

Even twenty-times lenses can clarify cockroach organs; if it could magnify five hundred times, perhaps it would reveal those fine details invisible to the naked eye..."

Although in recent days, Old Su gradually accepted many concepts proposed by Xu Yun.

But as an ancient science master, he retained some caution about certain ideas.

Such as microorganisms.

After all, this stuff is different from generators and electrolytic cells; Xu Yun has always put forward theories without evidence.

Acceptance is one thing; believing and treating it as truth is quite different.

At least before truly seeing microorganisms or bacteria, Old Su would have some doubts.

This is quite normal, an understandable human reaction.

In a certain sense.

The concepts Xu Yun articulated seem more absurd than brainwashing, almost like reshaping cognition...

We can only say that as Xu Yun presents more scientific tools, the possibility of these becoming reality continually increases, approaching confirmation.

Amidst Old Su and Xu Yun's conversation.

Mr. Xie's figure suddenly appeared at the doorway of the study courtyard:

"Sir."

Seeing this, Old Su promptly drew his thoughts back to reality:

"Oh, First Year, what matter do you have?"

Mr. Xie hurried forward, handing over something resembling a visiting card.

Then he whispered a few words to Old Su.

Upon hearing them, Old Su was delighted, quickly saying:

"Really? Please invite him quickly!"

Mr. Xie bowed and obeyed the order, while Old Su looked at Xu Yun:

"Xiaowang, the person you were waiting for has arrived."

"The person I was waiting for?"

Xu Yun was first stunned, then thought of something:

"Could it be Mr. Tongyu?"

As soon as these words fell.

Outside the study.

A somewhat elderly but bold voice was heard:

"Where is Wang Lin? Damned cliffhanger, hurry and update!"

...

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