Shall we go to open up the wasteland together tomorrow?

The glasses teacher’s words were tantamount to ‘fellow Taoist, please stay’.

Ethan did not expect that his well-thought-out and perfect tracking plan would die before it could be implemented.

After finishing sorting the test papers, the glasses teacher directly left Ethan behind.

Seeing the cloaked girl quietly walking out the door, Ethan felt helpless.

"Ethan, go to the laboratory where you will take the exam that day and wait for me. I will be there soon."

Ethan could only agree.

He ran out of the classroom. The cloaked girl was no longer in the corridor, and he couldn't help but shake his head.

I can only hope that she can pass the exam smoothly, and then I will settle the score with her.

Ethan didn't wait long before the glasses teacher came to the laboratory.

"sit down."

The glasses teacher pointed to the seat on the middle experimental table.

"Just call me Colin."

"Okay, Teacher Colin."

Ethan nodded in thanks.

"Actually, I asked you to stay because I just saw the answer to your last big question. To be honest, I was a little surprised."

He crossed his hands on his chest and his face moved slightly.

"Let's talk about the first answer first. The antidote currently on the market can indeed relieve snake venom, and the formula of the medicine given in your answer is completely correct.

But as you said, there is no problem in saving lives with this kind of antidote, but without exception, severe ulceration will occur in the injured area after using the antidote. "

"Even after the church was bathed in holy light, it was only temporarily restored, and the ulcer did not get better."

Ethan smiled slightly.

"This is because snake venom will coagulate when it encounters blood and is separated from the body's circulatory system. Even if the antidote is effective, it will not enter the blood circulation system and is still useless."

"And coagulated blood clots not only block blood vessels in the human body, but also cause pathological changes, so ulceration will occur over time."

Teacher Colin couldn't keep up with Ethan's thinking.

After all, what Ethan said was based on the theory of the human body's circulatory system, while Colin was still stuck in the current medical system, at least three generations behind.

"In short, although the poison in the body has been detoxified, there are foreign substances in the body, which causes body ulcers."

In fact, Colin's conversation inspired Ethan in disguise. The medical capabilities in this world are a bit biased, and he can make profits by relying on the information gap.

For example, develop venomous snake serum and sell it in Pang Ao's store.

Snake venom serum is not very difficult and does not require excessive experimental conditions.

The more I think about it, the more reliable it becomes.

After some explanations, Teacher Ke Lin was greatly inspired.

After bidding farewell to Colin, Ethan returned to the Wizard of Oz.

Ethan wasn't too worried about the exam.

He was now thinking about his snake venom serum.

There is a special drug inspection room in the Wizard of Oz, which is actually a simple small laboratory.

Although it is crude, it is enough for Ethan to use.

The mechanism of action of snake venom serum is actually not complicated. It is mainly made based on the fact that the body of an animal will automatically produce antibodies after being bitten by a snake.

Generally speaking, the snake venom is injected into the animal's body, and then the serum is separated.

Of course, the larger the animal's body, the higher the efficiency.

Past lives are generally extracted using horses.

If this method is really feasible, Ethan also wants to use horses to cultivate snake venom serum.

This reminded him of the promise he made to Xiaobai when they were in the mist world.

After going out, open a horse farm and let Xiaobai be a stallion.

Unexpectedly, it really hit home.

At this moment, it is first necessary to verify the feasibility of the theory.

Ethan took out a blood formula from the badge.

The best experimental subjects are mice.

Because mice do not have too many bacteria and viruses and are small and sensitive to snake venom, they are very suitable for experiments.

And what Ethan was holding in his hand was the secret medicine for white rats.

It can transform rodent organisms into harmless, hygienic, and sensitive mice.

Isn't it a good experimental material?

Moreover, the ingredients of this white rat secret medicine are not complicated, and it can be used in an hour even if it is backed by a medicine store like the Wizard of Oz.

"Two myotis, one-fifth of an ounce of ancient moss, one-fifth of an ounce of bloodvine, half an ounce of cinnabar, one-fifth of an ounce of white velvet root juice..."

Although there is a long list of recipes, they are all relatively cheap common herbs.

When Pang Ao learned that Ethan wanted to buy medicinal materials for experiments, he even saved Beiluo with a wave of his hand.

It only took Ethan two hours to process all the medicinal materials, and the rest was to prepare them.

Ethan was a little unfamiliar with preparing potions because the experimental props in this world were a little rough, which was somewhat similar to those of an alchemist.

He used to stay in the circus. Although he mastered many secret medicine formulas, he rarely practiced them.

So it's a little slower in terms of efficiency, but it's more reliable.

Ethan first heated the crucible slightly on the alcohol stove, then poured in part of the ground medicinal materials to further concentrate the paste.

When the potion is reduced to half its original size, pour in the cinnabar powder, add an ounce of water, and continue heating.

At this time, a part of the green liquid will be obtained. When only one-third of the original liquid remains after heating, lower the temperature to normal temperature and pour in the white velvet root juice.

After stirring evenly, a silver-green solution will be obtained.

This is the secret medicine for white rats.

This recipe is not complicated, although Ethan's technique is a bit clumsy, but fortunately the steps of the potion are not difficult, and Ethan did not make any mistakes, and it was a success the first time.

And now he needs a rodent.

That's even easier.

In this world equivalent to the European Middle Ages, it's easy to find a mouse.

Ethan goes to the bakery on Deep Blue Avenue to buy bread every day.

He became very familiar with John, the owner of the bakery.

The bakery's kitchen stores a lot of food, which becomes the target of the mice.

Old John set up a lot of traps around the kitchen to fight wits with these mice.

And in order to tell customers that there are no mice in his store, he will hang the captured mice in a conspicuous place on the street.

Although it's a bit disgusting, it's also a good gimmick.

After learning that Ethan wanted a few live mice, Old John generously took out a clothesline, and there were more than a dozen fierce mice hanging on the clothesline.

The big one was as long as Ethan 20 centimeters, and the small one could be caught in one palm.

"This was just caught yesterday. If you come a little later, I'm afraid you will have to wait until tomorrow."

These mice will be almost dead after being exposed to the sun for a while.

Ethan picked up the clothesline with a dozen mice hanging on it and returned to the Wizard of Oz.

For safety reasons, he also bought three wire cages on the way.

After these mice entered the cages, they all huddled in a corner of the cage, and their spirits were a little depressed.

The method of using the secret medicine for white rats is to feed them.

Ethan smelled the medicine, and he was sure that these little mice would not like the smell.

So he found some bread crumbs and expired milk from the kitchen and mixed the secret medicine for white rats into it.

It turned out that these mice were really hungry.

Although the mixed solution was still very pungent, these little mice didn't seem to care at all.

Soon all the secret medicine for white rats was consumed.

The rest of Ethan's work was to wait quietly.

PS: Recommended ticket through train