My Lady, Have You Ever Heard of Mulberry Fish Ponds?

Even as a science major, Gu Lan expressed no interest about that.

If it weren't for the exams in his past life and the system rewards in this life, he would have never gotten involved with agricultural classics like this.

"Master, you're back," Mu Yuyan came back to her senses from the book, tilting her delicate face upwards and looking at Gu Lan. She murmured, "I accidentally knocked over this book while cleaning your study today. Seeing some strange drawings inside, I couldn't help but pick it up and take a look. Can I read this book?"

Her lively eyes blinked, and she asked with pursed red lips, seemingly afraid that the book might touch upon Gu Lan's privacy.

"Of course, you can." Gu Lan affectionately rubbed her dark hair and gently smiled, "Books are meant to be read, my lady. If there's anything you don't understand, you can always come and ask me."

When it comes to the classics from his past life, your husband has a bit of knowledge, though not much...

"Thank you." Mu Yuyan thought for a moment, flipped through the pages of the book, and asked in a soft voice, "Can you tell me about this 'big wheel'?"

Gu Lan lowered his head.

It turned out that the drawing on the paper was a model of a waterwheel he had casually drawn in his free time. There were annotations from his literature: "When the land is elevated, use a waterwheel for irrigation; it's very convenient."

"This is called a waterwheel, also known as a drum wheel. It's an irrigation tool built on a river," Gu Lan described, "It can use the water flow to save labor and directly bring river water to the fields."

"Save labor? Is it a kind of immortal technique?"

Mu Yuyan asked, puzzled.

She didn't understand what utilizing water flow meant.

However, in this world, there were indeed immortal techniques capable of moving mountains and filling seas.

But cultivators at that level would certainly not use their immortal techniques for such trivial matters as field irrigation.

"It's not an immortal technique, ordinary people can do it," Gu Lan shook his head, smiling patiently, "This waterwheel is fixed on the river. The river's flow propels it, causing the waterwheel to rotate. On the waterwheel, there are fixed wooden tubes. When the water fills them at a lower point, it is carried up to a higher point and flows down along the wooden troughs to the distant fields..."

Gu Lan pointed to the waterwheel on the drawing, explaining with well-organized words and drawings as if he were giving a lecture.

Mu Yuyan leaned her head over, resting it on Gu Lan's shoulder, listening attentively. Her beautiful face was full of curiosity, resembling the smartest and the most beautiful girl in the class from his previous life.

After a moment, before Gu Lan could finish explaining the principles of kinetic and potential energy, Mu Yuyan suddenly understood.

With her intelligence, as long as it was explained once, she easily grasped the simple principles of farm tools. However, such novel tools were completely unheard of to her!

"Master, how did you come up with such an amazing tool?!" Mu Yuyan was amazed, her eyes filled with interest, fixed on Gu Lan.

This mysterious and charming man always brought surprises.

"Well... Is it really amazing?" Gu Lan raised an eyebrow and asked in return.

Mu Yuyan: "???"

"It allows ordinary people to achieve what even those cultivators cannot... Isn't that amazing?" Mu Yuyan's beautiful eyes widened in astonishment.

In her view, this tool was simply ingenious; after all, in this world, there had never been anything created by mortals that could replace immortal techniques! But the seemingly indifferent gaze from Gu Lan made the female Emperor lose confidence in herself!

It seemed that in this fantasy world, immortal techniques did restrain the development of technological civilization to some extent... Gu Lan thought, the labor wisdom of my hometown for five thousand years is just the most primitive.

"Come, my lady, look at these drawings, and you'll understand that the farming tool from earlier is nothing special." Gu Lan chuckled, walked to the table, and took out a stack of drawings, which were things he drew in his free time, recalling interesting things from his past life.

"Master, these drawings... trees, insects, and fish ponds?" Mu Yuyan's jade fingers pressed against her lips, her watery eyes showing confusion.

She didn't understand why these three seemingly unrelated things were put together.

Then, Gu Lan held the pen and drew three arrows on the paper, forming a closed loop with the three elements.

"Madam, take a look. These tree leaves can feed insects, insect sand or pupae can feed fish, and fish waste turns into fertilizer to nourish the trees. They mutually support and depend on each other..." Gu Lan explained attentively.

In fact, this thing had a simple name—mulberry fish pond! Anyone who has studied middle school biology would know. Using a special breeding model to maximize efficiency is much more advanced than a simple tool.

After listening to the explanation, Mu Yuyan gradually grasped the subtleties. She had a slight understanding when Gu Lan drew the arrows, but after hearing a few sentences, her beautiful eyes widened, and it seemed as if a marvelous blueprint appeared before her eyes!

To think of making the three elements mutually supply each other while reaping benefits at the same time, this kind of model was truly amazing! Mu Yuyan unconsciously covered her mouth.

However, it didn't end there! Mu Yuyan hadn't fully digested the shock of the moment, and the next few drawings overwhelmed her even more.

"This is the wooden ox and glinding horse, which can save people from carrying heavy loads by hand; that's a vernier caliper, which eliminates the error of the naked eye and measures to the millimeter..."

"This is a windmill, different from the waterwheel..."

"Cough, that one... it's called a mobile phone, not a rooster. It's a communication and gaming device. It might be difficult to manufacture now..."

Gu Lan chatted away. Mu Yuyan was dumbfounded! The wisdom products she had never seen before left her mind reeling, one after another.

It made her feel that the dominion she had held for more than twenty years seemed to be like sitting in a well and looking at the sky!

This had nothing to do with cultivation. It was just that the proud and clever female Emperor felt a double crushing of intelligence and knowledge!

After a while, Gu Lan finished speaking, and Mu Yuyan quickly handed him a cup of hot tea.

With a shocked expression on her exquisite face, she revealed full admiration!

"Master Gu, how did you come up with all this?!" For Mu Yuyan, what she had heard in just half an hour was too unbelievable.

She had never imagined that Gu Lan's small study contained vast knowledge that even the wisest people in the world had never touched! Compared to Gu Lan, those people in the court's Ministry of Works were nothing but a pack of imbeciles!

Faced with the overflowing admiration of his lady, Gu Lan waved his hand casually and smiled gently, "Looking up at the vast universe, observing the abundance of categories. If my lady is interested, I will draw them out for you to examine later."

Seeing Mu Yuyan's beautiful eyes filled with astonishment, Gu Lan felt that life in Langzhou suddenly didn't seem so dull and boring.

Knowledge that would have been considered annoying to discuss with girls in his previous life could be portrayed as a fascinating art before his lady. Who could resist that?

Gu Lan was ecstatic, far from the calm appearance on the surface. At this moment, the voices of Old Yang and Yexi announcing dinner could be heard. The two of them tidied up the books and left the study hand in hand under the moonlight.

At the same time, a mechanical voice sounded in Gu Lan's mind.

[You explained The Exploitation of Heavenly Treasures, Important Methods to Condition the People's Living and other ancient books]

[You explained one article of biological science]

[You explained...]

[Received Rewards]

[Spirit Spring + 1]

[Cultivation +5000 years]

[Immortal Stage Pill Recipe - Nine Revolving Fire Spirit Pill]

[Immortal Body Destiny +1000 (Current Destiny Grade: Blue)]

[Immortal-level Spirit Item - Vermilion Phoenix Fire Feather]

[Immortal-level...]