The construction of Yanhuang Academy is in full swing, but Li Zexuan is not idle, and it is very hard.

"Alas~! This speed can't work~! It's been almost half a month, and I've only written two textbooks, and it's a bit suspenseful at this speed~! ”

Li Mansion, West Courtyard, Study.

Li Zexuan looked at the two textbooks "Mathematics" (Volume 2) and "Physics" (Volume 1) on the table, and sighed.

If someone hears his words, they will definitely beat him up, you must know that compiling textbooks is a matter of learning Confucianism to do, and it would be good to be able to compile one a year, and this product has been compiled twice in half a month, and it is not satisfied, this is to go to heaven~!

But Li Zexuan was not satisfied at all, these textbooks he wrote were all about recalling the relevant subjects he had learned in school in his previous life with perverted spiritual power, and others were naturally incomparable in speed, but even so, Li Zexuan still felt that it was too slow, because in half a month, the academy was about to open, and he originally planned to open four courses for students first, but now there are still two textbooks left to write - chemistry and geography~!

Of course, the textbooks he compiled are not all rigid, not what to learn in the first grade of modern primary school, what to learn in the first grade of Yanhuang Academy, the different school systems on both sides determine that the learning content of each stage is also different.

At the beginning, the "Mathematics" (Volume 1) he compiled at Yanhuang Academy already covered all the content of the first and second grades of primary school, but the students in the Mathematics Hall had already learned almost half of the mathematics in the first volume, so Li Zexuan would write the mathematics in the second volume.

The two textbooks that are still missing, chemistry is easy to say, but it is estimated that it will be very troublesome to teach, because the chemical symbols in them were read according to the English alphabet when he read them in his previous life, but now it is the Tang Dynasty.........

You can imagine the scene at that time:

"Students, this is the chemical formula of the water molecule "Oh Eroh" (H2O), come and come, I have memorized it~! ”

2333333, this picture is so beautiful, I dare not think about it~!

As for the geography textbook, Li Zexuan didn't know how to start, because he didn't know what the current territory of Datang contained, how should he compile it~? Don't say give him half a month, even if he gives him half a year, he can't make it up~!

But he can't set up this course, and he can't do it, and aside from the territorial issue, many concepts in the geography course can be very useful, such as the concept of scale in the map, the concept of direction in the north, down the south, left, west, right, east, longitude and latitude, contour line, depth contour line, and so on.

(Ancient maps are not in accordance with the north down the south, left west right east, many ancient Chinese maps take the setting of up the south and down the north, left east and right west, which may be related to the emperor's "sitting north and facing south", so it is just convenient for users to watch, but there are also many ancient maps with the setting of up and down west and east east, which is not a unified regulation)

Regarding latitude and longitude, no one has defined the prime meridian in this era (in modern times, the international longitude through the original site of the Greenwich Observatory in London, England is called the 0 degree meridian, also called the prime meridian), when he wrote the textbook, he could define the prime meridian in the meridian of a typical building in Chang'an City, so that hundreds or even thousands of years later, everyone will look at the map according to the latitude and longitude defined by the Tang Dynasty.

In addition to these, the most important role of geography is to let students recognize the world and let them know that the Tang Dynasty only occupies a palm-sized piece of land in the world map, which is very useful for the later Age of Discovery.

"Alas~! How should this "Geography" textbook be compiled~? The rest is easy to say, it is the mountains and rivers in Datang, where should I go to find information~? ”

Li Zexuan pondered his chin and fell into deep thought.

"Xianggong~! Are you still busy~? This is the chilled mung bean soup that the concubine just made, you stop and taste it first~! ”

At this moment, the door was pushed open from the outside with a "squeak", and then Han Yuxi, who was wearing a thin white skirt, walked in with a small bowl that was bubbling with a hint of cold, and she saw Li Zexuan who was lying on the table and thinking hard, and couldn't help but feel slightly distressed.

"Oh~! The lady is here~! ”

Li Zexuan came back to his senses, then stood up and looked at Han Yu and said, "Heh~!" What are you doing with this hot day~? Look at your heat, let the people below do these jobs~! Come and sit~! ”

Han Yuxi smiled, put the mung bean soup on a few cases, and then said dissatisfied: "Xianggong, you also know that it is a hot day now~!" Then you've been locking yourself in the house every day lately~! My mother and I are worried that you will make yourself sick~! The concubine knows that Xianggong is working on the affairs of the academy, but she can't be tired of it~! ”

Li Zexuan's heart warmed, stepped forward to grab Han Yuxi's soft hair, and said with a slight smile: "Don't worry, the lady, the princess has kung fu, and the heat can't help me~!" Just take care of yourself~! ”

Han Yuxi rolled her eyes and said angrily: "Xianggong is deceitful again~!" Who said that people with kung fu are not afraid of heat~! Lu Guogong and his old man pulled several truckloads of ice from our house before, and you still want to fool me~? ”

"Ahem~! This ........."

Li Zexuan suddenly contaminated, Han Yuxi is right, although they practice martial arts, although they are not afraid of the cold, they are generally quite afraid of heat, unless you practice the kind of internal skills that are relatively rare in the Yin and Cold attributes.

Han Yuxi picked up the small bowl and stuffed it into Li Zexuan's hand, and said, "Okay~!" The concubine knows that her husband is busy, but you drink this bowl of mung bean soup first~! ”

How can Li Zexuan disagree~? He hurriedly nodded in response: "Okay, good~!" I'll drink it now~! ”

After that, just like a cow drink, he drank the mung bean soup in the bowl, and a wanton cold and cool, from the inside out, burst out in an instant, so that he couldn't help but shout "Refreshing~!" ”

Han Yuxi smiled, put the bowl away, and was about to turn around and go out, but she paused slightly at the door and hesitated:

"Xianggong seems to have encountered some difficulties, the concubine's physical ability is limited, I'm afraid I can't help much, but Xianggong can go out for a walk and relax, or, doesn't Xianggong have so many friends~? You can go to them to help~! There's no need to do it behind closed doors~! The concubine has been going all the way since she was a child, and she has entrusted the help of many people, otherwise, she can't marry her husband~! ”

Li Zexuan listened, was silent for a long time, and suddenly laughed: "There is~!" Ha ha~! Lady, you are really my lucky star~! ”

………………………

(End of chapter)