With the advent of Western learning and the steam engine, the name of the imperial concubine gradually spread among the people.

Students in the capital city often talked about this mysterious imperial concubine during their leisure time. They heard that she was not only well-versed in Western learning, but also personally taught at the Mingde Academy in the suburbs of Beijing.

The young students studying in Beijing were filled with admiration and curiosity. On their days off, they would go in twos and threes to the vicinity of Mingde Academy and wander on the small roads outside the academy, hoping to catch a glimpse of the imperial concubine's charm from afar.

On this day, the sun shone brightly, and a gentle breeze caressed our faces.

Several students waited early under the willow trees outside the college, their eyes glancing at the college gate from time to time.

One of the young students, dressed in a blue robe, rubbed his hands together and said in a low voice, "I heard that the Imperial Concubine will be teaching at the academy today. If we can meet her, our trip will not have been in vain."

Another person laughed and said, "Don't be delusional. How could we ordinary mortals like you easily meet someone as noble as the Imperial Concubine?"

Just then, the sound of horses' hooves came from afar, and a simple carriage slowly approached.

The students immediately held their breath, their eyes fixed on the carriage.

The carriage stopped in front of the academy, the curtain was gently lifted, and a woman dressed in a plain dress slowly stepped down.

She has beautiful features, an elegant demeanor, and exudes composure and wisdom in every gesture.

Following closely behind was a young girl, about eleven or twelve years old, with a scholarly air about her and bright, clear eyes.

The students were stunned for a moment, as if they had been nailed to the spot.

The scholar in the blue robe murmured, "This...this is the Imperial Concubine? She's so young!"

His companion beside him stared wide-eyed, speechless.

They had expected the Imperial Concubine to be aloof, dignified, and unapproachable, but they were surprised to find her so approachable and even possessing an ethereal gentleness.

Lin Yun noticed the gazes from the roadside, turned her head slightly, and nodded and smiled at the students.

This smile was like a spring breeze, leaving the students flustered. Some hurriedly bowed, while others blushed and lowered their heads.

Seeing this, Daiyu covered her mouth and chuckled, whispering, "Your Highness, these students must have come all this way to see you."

Lin Yun shook her head and smiled, "They're just young people studying, no need to worry about them." After saying that, she and Daiyu walked into the academy together.

The students stared at their retreating figures, unable to come back to their senses for a long time.

The scholar in the blue robe exclaimed, "The Imperial Concubine is not only extremely knowledgeable, but also so approachable; she is truly a celestial being!"

From then on, this chance encounter became a story they talked about with great relish, and the Imperial Concubine's reputation spread even further among the students.

As Yongzheng listened to the report from the secret guards, he sneered repeatedly. If it weren't for the fact that the Qing Dynasty needed to promote Western learning, he would never have allowed Yun'er to show her face in public.

No! We need to find a woman to replace Yun'er.

On one hand, he wanted the whole Qing Dynasty to know how amazing his Yun'er was, and on the other hand, he was jealous of those swarming suitors. He was really torn, and the feelings he had were indescribable to outsiders.

---

In the afternoon, after returning to Yanxi Palace, Lin Yun had just sat down to rest when Hongyao and Zhaohua rushed in excitedly.

Six-year-old Hongyao held a book called "An Introduction to Physics" in his hands, his eyes shining with excitement: "Mom, my sister and I have finished reading this book! When will you teach us chemistry?"

Zhaohua tilted her little face up and said coquettishly, "Yes, yes, Mother, we can't wait any longer!"

Lin Yun was both amused and exasperated by the two children's pestering. She patted their heads and said, "You two are quite impatient. Alright, Mother will start writing a chemistry book right now, and I'll teach you first when it's finished, how about that?"

Hongyao and Zhaohua cheered and sat down on either side of Lin Yun, watching eagerly as she picked up her pen to write.

Lin Yun pondered for a moment, wrote down the four characters "Introduction to Chemistry" on a piece of paper, and then began to organize the knowledge in her mind.

From the composition of matter to simple chemical reactions, she tries to explain things in simple language and with examples from everyday life so that children can easily understand.

Looking at the contents of the paper, Hongyao asked curiously, "Mother, is it true that 'water is made up of hydrogen and oxygen'? Water looks like just one thing!"

Lin Yun smiled and fetched a glass of water, explaining, "They may look the same, but they're not. Just like flour can be made into steamed buns or noodles, although the forms are different, they are essentially the same flour. Water is the same; it is composed of two invisible gases, which we just can't see normally."

Zhao Hua blinked and nodded as if she understood: "Then when I drink water from now on, won't I be drinking hydrogen and oxygen?"

Lin Yun was amused by her childlike words and pinched her little face: "You can understand it that way, but when they are combined, their nature is completely different."

And so, Lin Yun wrote and explained to the two children. Hongyao and Zhaohua listened intently, occasionally asking all sorts of imaginative questions, which Lin Yun patiently answered one by one.

Before she knew it, the city lights were on. Lin Yun stopped writing and took her two children to have dinner.

The two little twins are already three years old, and they are sitting at the dining table early, waiting for their mother and older siblings to arrive.

---

Half a month later, the first draft of "Introduction to Chemistry" was finally completed. Lin Yun presented the manuscript to Emperor Yongzheng for review.

After reading it, Emperor Yongzheng's eyes were full of praise: "It is very well written, profound yet easy to understand. Yun'er is becoming more and more experienced now."

Lin Yun smiled slightly: "Your Majesty flatters me. If this can be of any help to the students, I will be content."

After a moment of contemplation, Yongzheng suddenly picked up his brush and wrote the three characters "Author: Lin Jia" on the title page of the manuscript.

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