Zhang Zhao thought that he already knew Zhang Yi very well, but he knew less than half of Zhang Yi.

As far as books are concerned, the six or seven books that Zhang Zhao collected were only circulated in the market. There are still many that are not in circulation, and Zhang Zhao can't collect them if he wants to. Those books are only stored in the government office, and they can only be read there, and they are not read casually.

Zhang Yi has written several books on these invisible books, such as the most elementary physical chemistry and advanced mathematics, and has formalized several concepts such as physics, chemistry, science, and numbers (Arabic numerals).

These are all Zhang Yitian's big plans, which are to prepare for the cultivation of senior talents. However, these cannot be disclosed to the public for the time being, he is still collecting books, and he can't tear his face now, even for the sake of face, he can't make these public.

It's a long-term plan that takes years to prepare. The main thing is that the time is not mature, the technology is not mature, and the talent is not mature.

The time is not ripe, as mentioned earlier, Zhang Yi's power has not reached the time to be implemented, and if it is enforced, it will only cause internal instability. You must know that there are many people from powerful families under Zhang Yi, including Lu Su, Liu Ye, Li Hongzhang, Zhuge Jin, Chen Jiao, Bu Qi, Yan Xuan, Lei Xu and others, as well as the newly surrendered Zhu Zhi, Zhang Hong, Lu Xun and others, and his three wives are also powerful families, which has too much influence.

If you want to fully implement this system, or implement the imperial examination system, you must at least wait for Zhang Yi to occupy most of the land of the Han Dynasty, and at least pacify the Central Plains.

The technology is immature, mainly because of the problems of papermaking and printing. Zhang Yi has his own private property, most of which are managed by a few reliable businessmen, and only the core ones are handed over to Shi Qian and Tang Long to manage.

This core part includes the technology research and development department. After all, Zhang Yi is a traverser, and he knows that the technology is more advanced than the current one, so how can he not study it?

These technologies are mainly divided into two aspects, one is the development of technology, such as distilled spirits, cement and concrete technology, irrigation technology, urban sewer technology, road and bridge repair technology, mining and smelting technology, forging technology, etc., these Zhang Yi knows some of them, and many of these technologies are developed according to the initial knowledge of physical chemistry.

Of course, the most important thing is papermaking and printing.

The papermaking technology of this period was already very good, at least it was possible to write calligraphy. However, there are still many shortcomings, the paper is too soft, and it becomes brittle and difficult to store after being wet.

Zhang Yi has asked people to experiment with various materials to make paper, but the progress is not very large. It's not a matter of materials, the materials of papermaking are nothing more than reeds, bamboo, sawdust, etc., the difficulty is the problem of proportion, how much material is compared, how much water is added, all have to be experimented.

The cycle of making a batch of paper also takes at least ten days and eight days, plus the preparation of materials, it takes half a month, and sometimes it takes a month for the slow one.

As long as Zhang Yi has time, he will take a look at the research of papermaking, and in fact, he has also researched some better papers, at least much better than the paper on the market. It's just that in Zhang Yi's eyes, there are still flaws, so Zhang Yi vetoed it. At least until he made paper that could resist moisture, Zhang Yi was not ready to launch it.

However, he had already started to build a paper mill near Wanling, which was later known as Xuancheng and where rice paper was made. However, Zhang Yi also demanded that the sewage from the paper mill should not pollute the river, so he asked for more than a dozen degrading ponds to be built near the paper mill to degrade the sewage.

At this time, there is no biodegradation, and can only rely on the degradation ability of the earth itself, so when Zhang Yi digs the degradation pool, he requires digging deeper, at least more than ten zhang, and repairs it with cement concrete around the degradation to avoid the collapse of the degradation pool.

Zhang Yi is also working on printing, and he directly got on the horse with the clay movable type, directly skipping the engraving printing and wooden movable type printing. However, clay printing will also be difficult, and its technical difficulty itself is not very large, as long as you can find the right clay, it should be easy. Firing techniques can be obtained from ceramic kilns, tray blacksmiths can be made, and wax has long been used in life.

The only thing that hinders development is Mo. The ink of this period was more suitable for writing on the script, and less suitable for printing. Zhang Yi didn't understand the technology of making ink at all, so he had to let the craftsmen get it themselves.

In addition to developmental technology, of course, there is also military technology. Military technology mainly refers to warships, siege equipment, weapons and equipment, training technology, war horse breeding and breeding, and so on.

There is Meng Kang in shipbuilding, Tang Long in military equipment, and Zhang Yi knows a little about other technologies. The siege equipment Zhang Yi restored the trebuchet, the training technology Zhang Yi wrote the "Strong Soldier Drill Code", and the war horse breeding and cultivation Zhang Yi found someone who knew how to do it, but he solved the stirrup technology.

In fact, what Zhang Yi wanted more was gunpowder technology, and he had already handed it over to Ge Hong to study.

Zhang Yi is still temporarily stuck on one sulfur, two nitrate and three charcoal, and he knows more about artillery battles, that is, firecrackers.

There are also firecrackers in this era, Chinese New Year's Eve is a tradition that has been handed down for a long time, and firecrackers have a history of thousands of years. However, there was no gunpowder for firecrackers in this period, but the bamboo was thrown into the fire to burn, and when it exploded, it would explode, so it had the name firecracker.

Zhang Yi sometimes thought that if he summoned Ling Zhen by himself, maybe the problem of gunpowder would be solved. You must know that Ling Zhen was known as the Heaven-Shaking Thunder, and he specialized in making artillery.

If Ling Zhen had been summoned at the beginning, not only gunpowder would have been available, but even artillery would have been available. With artillery, one's own navy and navy will have a big killing weapon, and they will be invincible in rivers, lakes and seas.

Think about how much advantage it will have in the era of cold weapons on the sea, when artillery ships are rampant and there are artillery sieges on land? There are artillery in the defense of the city, and the enemy can be piled up to kill the fortress, what Cao Cao! Liu Bei! Wuhu! It's perfectly possible to push it flat.

But this is just a thought, Zhang Yi can't summon whoever he wants, and it's even very difficult to see anyone.

It's like Wei Rui, he can't see it even if he wants to. This is still because of geographical factors, as well as official factors, if he doesn't attack Guangling, the time for him to see Tang He may have to be pushed back.

Everything is difficult, but Zhang Yi has to do it, which is not just a five-year and ten-year plan, but a plan for hundreds of years and thousands of years.

Such a plan should not be rushed, as it will only do half the work with half the effort, and may even lead to bad things.