Previously, Lu Yu had no money and no people, so he could only concentrate on cultivation, and he didn't have much idea at all.

Now I have some spare money and some subordinates, although there are not many people, but at least I can do something.

For example, a little bit of the technology tree, create some products that are ahead of the times, earn more profits, have more money and influence, and can do more.

Lu Yu had no intention of hiding it.

When he first joined Taiping Dao, he had a humble status, no connections and no power, and no matter what he did, he needed to look ahead and think about it.

Now that he has a small foundation, there is no need to be tied up when he starts doing things.

Actually, as an ordinary person.

Lu Yu didn't know much knowledge, so he couldn't engage in scientific research and development in ancient times.

But as a Heroic Spirit is called to the future.

Although the only thing that can be brought back is the spirit stone for cultivation, and nothing else can be brought back.

However, the knowledge gained from the future can be remembered and brought back!

It is not impossible to use this method to engage in technology in ancient times!

Take advantage of items that were ahead of their time.

Whether it's making a windfall, expanding your influence, or strengthening your own power, it's all going to be easy.

When you are rich and powerful, it will be much easier to find the true Fa that you can cultivate.

Now, he only needs to wait for Bai Yuyao's summoning again.

Because of the time difference, more than a month has passed here, and she has not summoned again.

Lu Yu's strength is not in place, so he can't take the initiative to go over, so he can only wait slowly.

'Crackling...'

'Boom la la ......'

The bean-sized rain was like beads with broken threads, crackling on the roof and the green bricks on the ground, splashing patches of water.

The rain flowed down the eaves like a waterfall, gradually converging into a puddle in the courtyard.

There was too much water to drain out, and the streets outside had turned into streams, and I heard that many homes had been flooded.

Lu Yu's mansion is on a higher ground, so there is no such situation for the time being.

Lu Yu glanced at the gloomy sky, looked at the dense rain, and couldn't help but sigh.

"It's been raining for a month, and it doesn't even mean to stop."

Since the last time the bandits came back, the rain began to fall intermittently, I thought it was a long drought and nectar, and God was finally going to give the people a way to live.

Who would have thought that the sky was like a hole, and the rain never stopped, and it became heavier and heavier, and many places were already flooded.

First there was a drought, and then a flood, and it was really difficult for the people in these years, and it was really dire and dire for the people.

The rain kept falling, and everyone was a little irritable.

Lu Yu had nothing to do, so he could only practice with his head covered in the room.

His cultivation is too low now, he doesn't even have the second level of Qi training, and his mastery of Feng Shui secret art is also progressing slowly, and the only thing that makes him happy is that the progress of the martial arts is very fast.

In the past month, Lu Yu's growth in martial arts has been almost visible to the naked eye.

According to Master Ruan, one month's hard work can beat others for several years!

I don't know if Lu Yu is talented in martial arts, or because he is cultivating immortals and feeding back martial arts, so he has made particularly rapid progress.

Lu Yu felt that it might be both.

Just when Lu Yu was practicing, he suddenly felt something.

He couldn't help but smile faintly.

"Here we are."

Like last time, it was also a month, and it was finally time to be summoned again.

……

Inside Bai Yuyao's boudoir.

A variety of delicacies are placed on the table.

There are a lot of things she likes to eat, and she thinks that Lu Yu will definitely like it, so she specially ordered the kitchen to prepare it.

A phantom slowly reappeared, this time, Lu Yu did not change much, not much different from a month ago.

"You're here, I've got a lot of delicious food for you!"

Looking at her heroic spirit, the little rich woman smiled.

Lu Yu nodded, glanced at the table full of delicacies, and looked at the smile on the little rich woman's face, and for some reason felt much more relaxed.

"I need to ask you to help me gather some information." Lu Yu spoke directly.

"What information?" Bai Yuyao asked curiously.

Lu Yu thought for a while and said, "I need a book, called Tiangong Kaiwu, you can help me find it, if you can't find it, collect some scientific and technological products that can be manually made before the revival of the aura." ”

"Heavenly Creation?" Bai Yuyao listened to the name of the book and the words behind it, and couldn't figure out what Lu Yu wanted to do for a while.

But since it was Lu Yu's request, Bai Yuyao didn't ask much, and directly nodded and agreed.

"Okay, I got it!"

"You eat first, try the food this time, there are a lot of things I like to eat, I think you will like it too."

"I'm going to collect this information right now."

"Okay." Lu Yu looked at the food in front of him and couldn't help but move his appetite.

Although after becoming a deacon of Taiping Road, he has a million-dollar family property and can eat a lot of good things, but in terms of the taste of food, it is definitely not as good as these delicacies prepared by the little rich woman!

Lu Yu picked up a fried shrimp and took a bite directly, the shrimp shell was fried and crispy, and it could be chewed directly.

And Bai Yuyao also began to collect information for Lu Yu in this regard.

Because she doesn't know much about this knowledge, even if she searches for information and books on this subject, she can't tell whether it's true or not.

If you give the fake to Lu Yu, it will definitely not work!

However, although I don't know this knowledge.

But Bai Yuyao clearly understands a truth, that is, professional things should be done by professional people.

It's not always best to do everything yourself.

Bai Yuyao immediately used her connections to contact several scholars who specialized in ancient times, and put her request to them.

Although these ancient research scholars are very strange, what does this eldest lady of the Bai family need these materials for, do they play in the wilderness to survive?

But they still do their best to collect it, and at the same time, they have to ensure the authenticity of the content of these materials.

After a while, some information came one after another.

"Come and see if this is the information you need." Bai Yuyao turned her head to look at Lu Yu and said with a smile.

"Okay." Lu Yu immediately floated over when he heard this.

On the clear light curtain in front of you, there are modern scientific and technological products that can be made in ancient times.

【Saltpeter Ice Making Method】

【Coarse Salt Purification】

【Clay cement】

【Soap making】

【Production of clear glass】

【……】

Lu Yu looked at the information in front of him seriously.

The first one is a bit unreliable.

Saltpeter ice may seem like a lot of fun, but in fact it is completely worth the cost.

This thing requires a lot of saltpeter.

Instead of using this thing to make a luxury like ice, it can be used to make gunpowder, a dirty flintlock pistol, arquebus, explosives bag, and the like.

Gunpowder was discovered very early in ancient times, dating back to alchemy in the Spring and Autumn period.

But because there has never been a perfect ratio, the burning speed is very slow, and the combustion is not enough.

For a long time, the so-called gunpowder was just a simple mixture of charcoal, sulfur and nitrate, which was very resistant to storage and transportation, with many impurities and little power, and was more suitable for fireworks.

But in fact, it's not enough to just have a match.

Purification is the key of the key.

Charcoal purification, sulfur purification, saltpeter purification.

Increasing the purity of these materials and then making them more powerful in the best ratio is the only way to make more powerful gunpowder.

This requires more information, such as new methods for preparing potassium nitrate (saltpeter) and how to purify sulfur and charcoal more conveniently.

Lu Yu shook his head, skipped this chicken option, and continued to look at the others.

Coarse salt purification method.

This method even mentions the method of making coarse salt in large quantities.

Seawater drying method.

Seawater is introduced into the salt pans to dry, and when it is almost dry, it is replaced by a new pool, and after crystallization, it is coarse salt.

The purification of coarse salt is also very simple, mixing coarse salt into water, and then adding lime milk made of limestone, impurities will appear.

After repeated filtration, distillation is used to obtain refined salt that has no bitter taste.

This method is very simple and convenient, but it can make quite a beautiful salt, which is really a great benefit.

The only risk is that in ancient times, it was a felony to sell illicit salt.

However, the more business is written into the criminal law, the more profitable it is!

In all dynasties, the people who sold illicit salt were repeatedly banned.

Even if there are a lot of risks, this path can still be considered.

Lu Yu then looked at the other materials.

Seeing that Lu Yu was looking at it seriously, Bai Yuyao glanced at the food on the table, hesitated, but still didn't hold back, and secretly ate several bites!