Before the two of them left, Li Su took out a volume of physics and chemistry that he had edited and handed it to Li Chunfeng.

Li Chunfeng just flipped it open and glanced at it, and couldn't help but be overjoyed.

It turns out that this is science!

It turns out that science is so mysterious!

Science, it seems, is more interested than divination.

Li Su continued: "These two books, Yuan Gong can also watch them, but remember not to spread them for the time being. And don't tell me about what is happening here today. ”

Li Chunfeng hurriedly said: "Master don't worry, we will definitely not say it!" ”

Yuan Tiangang also said that he would keep it secret and would not confide in half a word what happened during their meeting today.

After the two left, Li Su found Liu Shan again and asked Liu Shan to tell the people in the mansion that they saw the birds in the Liang Wang's mansion and not spread the word.

After receiving Li Su's instructions, Liu Shan hurriedly went down to do things.

In the following time, Li Su began to study the matter of ice making.

Making ice is actually not as simple and fast as Yuan Tiangang and Li Chunfeng seemed.

In fact, as early as the first time Liu Shan came to report, Li Su ordered people to prepare later.

Saltpeter dissolves in water, which can indeed take away a lot of heat, but the heat taken away is actually limited.

At least, with the current temperature of more than 20 degrees, it is impossible to drop below freezing at once.

If you drop it down at one time, you can probably reduce it by more than ten degrees.

Therefore, as early as when Yuan Tiangang and Li Chunfeng came, Li Su secretly ordered people to adopt the method of grading ice and began to continuously cool the water.

By the time Li Su performed the condensation into ice, the temperature of the water brought in had dropped to below ten degrees.

It is for this reason that this can quickly condense into ice after Li Su adds saltpeter.

Now with saltpeter mines, ice can be made in the summer.

Of course, if it was just for his own enjoyment, Li Su would not need to buy all three mines rich in saltpeter.

The reason why he did this was because he thought that Li Su was going to sell ice cubes to the outside world.

Ice cubes are definitely a sought-after item in the summer, and the average wealthy family can't afford to use them.

Only in the palace, there are those families, can use ice.

The ice they used was dug in advance and stored in the winter.

Wait until the summer to take it out and use it.

The production of ice cellars, as well as the cost of storage, make the ice extremely expensive.

The average rich man can't afford to make an ice cellar himself.

I can only buy some ice cubes on the hottest days.

Of course, the price of this ice cube is very expensive.

In the summer, making ice from saltpeter and then selling ice cubes is definitely a lucrative industry.

Of course, Li Su thinks further, for example, in fact, simply selling ice cubes is still not the best choice.

If it can be used to make popsicles and ice cream, then at what price can it be sold for in Datang?

Well, well, to be honest, summer is coming, in fact, Li Su himself also misses the taste of ice cream very much.

……

Cheng Chuliang has been playing crazy lately, and he is crazy about football.

Then the friends who were familiar with Qin Huaiyu, Wei Chigong and others pulled their brother Cheng Chumo and others to form a second ancestor football team.

I have to say that things gather like and people are grouped.

These two ancestors really smell the same.

After they were introduced to football, they quickly fell in love with the exciting and exciting sport.

Next, the football team they formed continued to run in according to the method that Li Su told them.

Their technology is also constantly improving.

Now, football matches are quite popular in Chang'an City.

Build big and small football teams.

And Cheng Chuliang and the team they formed gave themselves a resounding name, called "Do it if you don't accept it".

Well, these guys heard these eight words from Li Su's mouth, and they felt that it was very in line with their temperament, so they directly used the last four words as the team name.

If you don't accept it, you will do the team, and among the large and small teams in the vicinity, the record is brilliant and invincible.

How lonely it is to be invincible!

At this time, Cheng Chuliang couldn't help but think of the scene when he was in the Liang Wang's Mansion and several of their friends were ravaged by the Praetorian Guards.

How small is this guy's heart, can he not repay such a big hatred?

So, Cheng Chuliang took his disobedience to the team and asked Xue Rengui to fight.

And Xue Rengui, of course, would not take them to heart, and in the face of their provocation, he confidently agreed.

As a result, the 11:0:0 formation of the escort army encountered the 4:3:3 formation of the disobedient team, and was ravaged by the unobedience and dry team madly.

The final score actually reached an astonishing 117:35!

After the big score victory, Cheng Chuliang them and left with a high spirit.

And the Liang Wangfu team was breathing fire with anger, and they couldn't bear this breath at all.

So, Xue Rengui found Li Su and asked them the reason for their failure.

At this time, Li Su was busy making ice cream.

If you want to make ice cream, you first have milk, and if you want milk, you first have cows.

And cows were a rarity in the Tang Dynasty.

At least for a while, it's not easy to find.

Li Su can only settle for the second, goat's milk, or the cows and sheep that can be milked.

First of all, we must find a suitable milk source, and only after we have milk can we make ice cream with milk, sugar, etc.

And Xue Rengui came this time to ask for advice on how to win a football game, and Li Su really didn't want to deal with him.

Considering that Xue Rengui was the first general under him, Li Su was patient and explained the skills of football to Xue Rengui.

This time, Li Su didn't hide his secrets, and even didn't hesitate to spend the loser value to search for some cooperation skills between the team members and explain it to Xue Rengui.

And after listening to Li Su's explanation, Xue Rengui suddenly realized that he was like an initiation.

It turns out that this is the case, it seems that I lost unjustly some time ago.

After going down, Xue Rengui began to train the football team according to the skills taught by Li Su.

In fact, although it seems that the training of the football team has delayed their training.

In fact, after the introduction of football matches, the enthusiasm of the soldiers for training grew.

Because the soldiers who can be selected into the Liang Wangfu team are not fixed candidates, but must be the dozens of people who are the most prominent in training.

And then these people will also be constantly rotated.

Of course, other people can also spontaneously form a team and challenge the Liang Wangfu team.

Under this kind of selection and promotion, the training effect of soldiers has been improved.