"The officials of the Han Dynasty will rest on the fifth day."

That is, one day off for every five days of work. On the sixth day of the week, that is, on the weekend, many people go to the Datong Hall to attend the provincial capital and reflect on their virtues. And it's also a gathering of friends.

Unlike others, after attending the provincial capital, Fei Zhigang would come to the Yellow River, and he would walk alone along the weedy path next to the river.

Now the Yellow River is no longer the Yellow River, just last year, the Yellow River has been changed to the north of Zheng County, the Huai River returned to the old way, but the river is still turbid, here because every time the river is abundant, the river Yamen will loosen the sand at the bottom of the river with iron ploughshares, and deepen the river channel together with hydraulic scouring, so as to restore the old appearance of the Huai River channel, according to the records of the Water Affairs Division, in the past year, the river has deepened no less than five inches, and in the long run, at most ten years, the Huai River can be restored as before.

However, even now, because the Yellow River has returned to its original path, there is no "Huang Qiang Huai Weak" block, the Huai River water can smoothly enter the sea from the old river, the Huai River on both sides of the Huai River for the first time in last year's summer flood, there was no large-scale flood, maybe a few years later, the Huai River on both sides of the river can see yesterday's richness, and the south of the Yangtze River together become the land of fish and rice.

"God bless the Ming Dynasty!"

Fei Zhigang looked at the stretch of a sun-soaked rice field on the opposite bank, looking at the spectacular appearance of the undulating rice waves, and couldn't help but praise in his heart.

However, when he was so admired, his face did not have the slightest joy, but a worried look, he knew that God blessed the Ming Dynasty and what it meant to mean the end of the Qing Dynasty!

Fei Zhigang is not a native of the Ming Dynasty, he is actually a native of Manchuria and the White Banner, the son of the Minister of the Interior, the third-class Bo Eshuo, and the younger brother of the Empress Xiaoxian of Emperor Shunzhi. His real name is Fei Yangu, and he inherited his father when he was fourteen years old, but he didn't feel the good times, just an adult, and he didn't have a turn to enjoy the blessings of the Qing Dynasty, just because he moved west all the way, the so-called family business was all left in Beijing, and in the end it was cheaper than the Ming Dynasty, but he was still the third-class uncle of the Qing Dynasty, and he was still the Qing Dynasty and the emperor's servant.

Three years ago, Fei Yanggu fled to Daming as a refugee, but the reason why he fled to Daming was not for anything else, but to learn "practical learning".

What is Practice?

It is the study of "applying it to the world".

Although he initially wanted to be admitted to the Royal Martial Arts Academy, but in the end, because of his identity, he failed to be admitted to the Martial Arts Academy as he wished, but even so, after a year of preparatory studies, he was also admitted to the best academy in the Ming Dynasty - Qinghe Academy, where he studied mechanics.

Now, in a few months, Fei Zhigang will end his studies, which also means that his "study abroad" career will also end.

What's next?

Fei Zhigang's heart was secretly thinking, and his brows were sometimes furrowed.

"Qinghuai,"

The shout from behind him made Fei Zhigang turn his head to look.

It is Tong Guodong, unlike Fei Zhigang, he is not a noble of the Qing Dynasty, but he is also a banner man, and he is also a slave of the Three Banners, he was born in Shengjing in the year when the Qing Dynasty entered the customs. The reason why the two of them became friends regardless of the disparity in status was not only because the dormitory where the two lived was in the same courtyard, but also because Tong Guodong's studies were excellent, so Fei Zhigang admired him, and the two became friends.

Because they are friends, Fei Zhi just knew him, his origin and family background. Once, Tong Guodong once told him about his birth. At that time, the Great Qing Kingdom had not yet entered the customs, and his mother yelled in the house for half a night, and then gave birth to him. The midwife came out of the hut and told him that Amma, who was preparing to go on the expedition, had given birth to nothing else, but a son, and the father asked again.

"Boy?"

After receiving an affirmative answer, Ama said in a helpless tone.

"The fourth, the master has another minion, and he will be able to serve the master and beat the Ming people in the future......"

After saying that, he put on his armor and went into battle.

Then, the Great Qing Kingdom entered the customs and entered the Central Plains. Then, he Ama and his three elder brothers died, and it was precisely because of this that his mother wanted him to study, originally wanted to be an official, but who would have thought that he was sent by the emperor to Kanto and Daming.

If you get caught, you're going to be killed.

Oh, yes.

If you get caught here, you're going to be killed! So, it's also a job of pinning your head to the waistband of your pants.

Again, after this thought popped up in his heart, Fei Zhigang looked at Tong Guodong and smiled.

"Anzhi, why are you free today? Didn't you go to visit Professor Niu in the first place? ”

Professor Niu in Fei Zhigang's mouth is now the most well-known Western professor in Qinghe Academy - Newton, three years ago, he came to Daming, as soon as he arrived at Qinghe Academy, he showed the professors in the academy the three disciplines he "created" - calculus, mechanics and spectroscopy.

However, what disappointed him was that in Qinghe Academy, he found that the calculus he studied lacked a clear and rigorous logical foundation, while the discipline of Qinghe Academy was relatively mature, and unlike the classical geometric argumentation method he adopted, Qinghe Academy started from geometric problems, used analytical methods to introduce calculus concepts and derive arithmetic rules, and its mathematical rigor and systematization were beyond Newton's reach.

The reason for this disagreement seems to European scholars to be almost natural: the success of Greek plane geometry had a very profound impact on European mathematics: it is generally believed that only the method of argumentation in geometry is rigorous and true mathematics, and that algebra is only an auxiliary tool. It was not until Descartes and Fermat advocated an algebraic approach to the study of geometry that this attitude gradually changed. However, on the one hand, the geometric way of thinking is deeply rooted in the hearts of the people, but on the other hand, the algebraic method is still immature, and the real number system has not been established for a long time. This is also the reason for the gap between the two.

Of course, Newton didn't know that the calculus of Qinghe Academy was completely introduced by Zhu Mingzhong through his university studies, and was based on the accumulation of a large number of achievements after hundreds of years of efforts in countless mathematics.

And Qinghe Academy is ahead of Europe, not only mathematics, but also in physics, chemistry, biology and many other disciplines, there are also places where they are ahead of their European counterparts, although there is no lack of Zhu Mingzhong's role as a "golden finger", but now the achievements of Daming in these disciplines are still enough for European scholars not to despise.

It is precisely because of this that Newton, Hooke and others have put away their inner pride, while learning from the scholars of the Ming Dynasty as students, while spreading their knowledge in the Ming Dynasty and continuing their research.

The mechanics and spectroscopy pioneered by Newton at Qinghe Academy still made him famous, and he was even invited by His Majesty several times to go to the palace to discuss mathematical problems with His Majesty. Now Newton is already a tenured professor of Qinghe Academy - tenured professor system, as the name suggests, that is, once hired, the employment period can be extended for life, not subject to the assessment of the school's various stages of teaching and scientific research workload, and there is no pressure to be dismissed, and they also enjoy the tenured professor allowance issued by the school. Of course, Newton has now become a naturalized Mingren.

As the most well-known professor at Qinghe Academy, only the most outstanding students can become his students, and Tong Guodong is one of them, and his main research is mechanics.

"Professor Niu went to Guozijian in Nanjing, so he ......"

Smiling helplessly, Tong Guodong glanced into the distance, and then said.

"When Professor Niu returns to school, I will graduate."

"You should go on to graduate school,"

Fei Zhigang persuaded almost without thinking, but as soon as the words came out, he knew that this possibility was almost zero.

"At home, we're urging us to go home."

The so-called "going home" is to go back to Shaanxi and the "Qing Dynasty" to help the Qing Dynasty train and build weapons in preparation for the Ming attack.

Walking to the river, Tong Guodong looked at the "Yellow River" in front of him, which had "become" into the Huai River, and then said in a low voice.

"Back then, we came here to learn the training of the Ming Dynasty, if we can't learn to train the soldiers, then learn to build the machine, but after learning the machine, we know that the machine is not just about making the machine, there are all kinds of other knowledge to learn, from mining to metallurgy, to machinery manufacturing, and so on, is it not as simple as drawing a scoop according to the gourd, but ......"

Looking back at Fei Zhiyang, Tong Guodong smiled bitterly.

"When I go home, how do I build soldiers with what I have learned, and how do I build strong soldiers?"

What he learned was not the art of building soldiers, so he was naturally not liked by the imperial court, and when the time came, he would naturally not be reused by the imperial court. It is even possible to be blamed by the imperial court.

This is also Tong Guodong's helplessness, although he is helpless, he does not dare to stay here. According to the laws of the Ming Dynasty, their behavior here is to be spies of the enemy country, which is a major crime of killing the head, so in the past few years, the most worrying thing is that one day their identity will be leaked.

"Actually, even if we go back, what's the use?"

Pointing to the Huai River in front of him, Tong Guodong sighed.

"You see, the Ming people can turn yellow into Huai, and they can make the banks of the Huai River a land of fish and rice again, what can we do?"

After such a sigh, Tong Guodong's expression became a little lonely, and finally he whispered there.

"Let's ...... Even if we study hard here and return home in the future, with the situation at home, how can we catch up with the Ming Dynasty? ”

"And what do you want?"

Fei Zhigang stared at Tong Guodong and asked.

"Is it difficult, do you want to defect to the Ming Dynasty?"