Zhao Liben gave two more instructions before he finished speaking. Zhao Hao then took out an envelope from his sleeve and handed it to Zhao Liben, saying:

"Here is the contract with Miss Jiang, and the sugar recipe I promised to give her. Grandpa, please deliver it on my behalf."

"Oh? Is this your recipe for turning frost into snow?" Zhao Liben's eyes lit up, and he took the envelope with curiosity and said, "Grandpa really can't figure out where you learned this amazing skill from?"

"Hehe, didn't I say that Taizu appeared in spirit?" Zhao Hao smiled vaguely, holding Zhao Liben's hand and said, "Wait until we leave, Grandpa will take a look slowly."

"Yeah." The recipe was given by his grandson, so of course Zhao Liben had to respect Zhao Hao.

He suppressed his curiosity, put the envelope in his arms and hid it close to his body. After confirming that it was correct, he came out to send his children and grandchildren to the dock.

Zhao Liben was in the carriage, watching the passenger ship full of yellow flags slowly sail away from the Dongguan Wharf and disappear from sight.

Only then did he look away with a sense of loss.

Just as he was about to take out the envelope, Zhao Xian got into the car again.

Zhao Liben had no choice but to withdraw his hand, and patiently returned home. He found a random excuse to send Zhao Xian away, then returned to the study and bolted the door from the inside.

After doing all this, he carefully took out the envelope, pulled out the sugar recipe and looked at it with bated breath.

Who would have thought that the sugar recipe only had ten characters on it - pouring brown sugar into yellow mud soup will produce white sugar...

Zhao Liben's eyes widened, his jaw almost dropped to the ground in shock, and he couldn't help but cry out: "Oh my God, it really is the spirit of Taizu appearing..."

Otherwise, why is it that others can't think of such a simple method, but it allows their grandchildren to make a lot of money?

~~

After leaving Yangzhou, the fleet headed north, traveling slowly over 2,000 miles on water, and it took almost 20 days to reach Beijing.

The further north you go, the colder it gets. Once you enter Shandong, the river freezes over. It is only thanks to the countless workers who work day and night to break the ice that the grain ships carrying grain to the capital can continue to pass.

In fact, half a month ago, the Governor's Office of the Grand Canal issued an edict prohibiting all civilian ships from going north along the canal in order to ensure the smooth flow of grain transport.

Of course, passenger ships flying yellow flags could continue to pass through the canal as long as they paid a de-icing fee. Therefore, many candidates lent their yellow flags to merchants heading north as a cover. It was said that one flag could be exchanged for at least fifty taels.

However, young masters like Zhao Shouzheng, Eryang, and Wu Kangyuan naturally look down on those trivial matters and would not do such a degrading thing.

These days, Zhao Hao spent almost all his time hiding in the cabin except for eating, drinking, defecating and urinating.

He asked Gao Wu to set up a small table for him in the **. He spent the whole day wrapped in a quilt, sitting by the brazier, sometimes thinking hard, sometimes writing furiously. His enthusiasm for work was much greater than when he was in Jinling.

"Oh, if I had held on tighter then, why would I have to suffer like this now?"

Zhao Hao rubbed his sore wrist and put down his brush to rest for a while. He blamed himself for being too lazy at the beginning. As a result, he regretted not having learned enough when he needed it, and could only cram at the last minute...

Wang Wuyang and Hua Shuyang wanted to help, but this book had little room for writing and much room for thinking, and it also required a lot of drawings. They had never touched it before, so they could only make matters worse.

Zhao Hao wrote a geometry booklet, which he named "An Introduction to Geometry" based on Legendre's "Foundations of Geometry".

Legendre's "Foundations of Geometry" was a translation of Euclid's "Elements". Legendre rewrote it in modern language into a popular geometry textbook, which has been used in later generations.

The more the two students couldn't understand, the more curious they became. They stayed by Zhao Hao's side, one on each side. Every time Zhao Hao wrote a manuscript, the two of them couldn't wait to study it. They were all extremely smart people, and they could see some clues as they read, and they were fascinated.

~~

Zhao Hao put down his pen and stretched his sore shoulders, but his two disciples did not come to give him a massage.

He glanced sideways and saw that the two of them were studying the manuscript he had written earlier face to face.

"Can you understand it?" Zhao Hao was very pleased to see the two people fascinated, so he asked with a smile.

"I don't quite understand." Hua Shuyang hurriedly replied, "I am a foolish student. I feel that Master is explaining a kind of Tao, which is like mathematics, but different from mathematics."

"Yes, it's amazing. Such refined language summarizes the essential truth of thousands of appearances. This is the Tao." Wang Wuyang also said with respect: "Master is really a rare genius. This is a book similar to the Book of Changes."

"This is not something I came up with." Zhao Hao wanted to claim the name as his own, but unfortunately, in twenty years at most, missionaries would bring "Elements of Geometry" to China. Wouldn't he be in trouble by then?

So he said modestly: "This was written by a Western philosopher named Ou Zi two thousand years ago. I just improved it slightly..."

He still shamelessly took all the credit for Legendre's achievement. Who could blame him for the fact that Mr. Legendre was not born for another 200 years?

"Isn't that the time when hundreds of schools of thought contended with each other in the pre-Qin period?"

Hua Shuyang and Wang Wuyang could not help but be shocked. They did not expect that such a brilliant civilization existed outside of China.

"Then the Origin written by Ou Zi is the Western version of the Book of Changes, right?"

"You can say that." Zhao Hao nodded slowly. The geometry developed in ancient Greece is recognized as the foundation of modern science. Euclid's "Elements" not only almost perfectly explains geometry, but also shows the world a rigorous deductive logic system.

Induction and deduction are two indispensable ways of thinking for the development of modern science. Confucian culture emphasizes induction and neglects deduction. If one of the two conditions is missing, it will be difficult for modern science to develop. What Zhao Hao has to do now is to make up for this shortcoming for the Ming Dynasty in advance... When Xu Guangqi comes to do this decades later, it will be too late.

Including the lesson I taught to the students before, it was also to help the two get rid of the deep-rooted concept of "harmony between man and nature" and let them realize that the laws of nature and the laws of the human world are two different things and cannot be combined, but should be distinguished.

If you want to promote science, you must first clear away the obstacles. This requires a lot of effort and a long time to achieve...

~~

Along the way, Zhao Hao introduced the many benefits of geometry to his disciples and assigned a task to Eryang.

He said to his disciples: "After you arrive in Beijing, you should interact more with your classmates. You may print my book "Geometry: A Brief Introduction" into a booklet and give it to your classmates as a gift. If there are people who share the same interests, you can get in touch with them more and discuss more. If anyone wants to learn this subject, you can ask them to come to me."

"If they are not interested in geometry, you can package it like this... say that it is about the pursuit of knowledge through investigation of things, and that it is truly the pursuit of knowledge through investigation of things." Zhao Hao smiled cunningly and ordered: "If it is truly irrefutable that knowledge is derived from things, I don't believe that those scholars will be able to sit still."

"Yes, Master." Eryang responded respectfully and kept Zhao Hao's mission firmly in mind.

If it were in the past, they would definitely ask why the master opened the threshold for teaching. But starting from the lesson of "Open your eyes to see the world", the two of them not only regarded Zhao Hao as a teacher to serve, but also regarded him as a preacher of wisdom, and were determined to follow him until death.

Since we are preaching, of course the more believers the better...

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