"This?? Yes, there can be. "Pang Degong didn't have a good airway.

Then, Lu Chen threw him another book - "Pharmacology". Pang Degong simply looked at it, it was all basic content, but it was enough for people to learn the solution to ordinary diseases, and it was related to Shennong, so he had to nod.

Then, Lu Chen threw him a copy of "Mathematical Numbers", and Pang Degong saw that there were various exquisite algorithms in it, and even combined with reality, he studied the algorithms of cities, mountains, rivers, etc., which looked quite complicated.

The old man shook his head: "This technique can be used as a leisure hobby, and it is not allowed to set up subjects." Useless. ”

"Old man, there are nine counties in each state, so how many counties are there in the world?" Lu Chen asked.

"Eighty-one."

"If there are eighty-one villages in each county, how many villages are there in the world?"

"Huh??"

"Six thousand five hundred and sixty-one. Again, there are 6,561 people in each village, how many people are there in that day? ”

"Huh??"

"Four thousand three hundred seventy-six thousand seven hundred twenty-one." Lu Chen said with a smile, "Sir, this is still all the numbers of ninety-nine eighty-one, if you really use different real numbers, then how to count?" This is still the most basic application, and the distance from the moon to the earth, does the old gentleman know? I can count, it's also in this book. ”

The old man was stunned.

Seeing that the old man was shocked, Lu Chen threw out another book "Construction Machinery".

"This is a strange kink?? Well, let's talk about what it's for. The old man learned to be obedient and did not refute it directly.

"To build the Great Wall, the old gentleman must know how many lives it cost, right? If that's too far. Let's just talk about the near, building the city, you should know that this is a big project, but do you know how many people and how much time it took me to renovate and strengthen the Mayi? ”

"The old man has seen your city, it is different from other places, and it is extremely tall and strong, I am afraid that there will be as few as 10,000 people, and it will be half a year?"

"Eight hundred and seventy-two people. There was also a guy in the middle who broke his leg. I didn't continue to do it. The time is forty-two days. ”

"How is that possible?"

"Cement can significantly slow down the construction time, and most importantly, cranes with pulleys converted from rock throwers, as well as trolleys. There are many other machines. And. Steam engines have also been used in coal mines, iron smelting bureaus and cement plants. Ten times more efficient! In other words, what used to be possible for ten people to accomplish in one day now only needs one person for one day. If the machinery is used in civilian use. It's also very efficient, and I'm currently preparing to renovate the houses that have been damaged in the war, which used to be a huge project, but now, it's not. Moreover, you know that I am now vigorously building roads, cement roads, and I am going to connect Yanmen to Yunzhong Jiuyuan, and even plan to re-lay cement on Qinzhi Road in the future. In this way, from Yanmen to Yunzhong, the cavalry only takes two days, and from Jiuyuan to Chang'an City, it only takes three days! The old gentleman should understand that ordinary people and businessmen will also benefit greatly. At the same time, the smooth flow of roads helps us to control the frontiers more effectively. ”

"Having said that, how can such miscellaneous studies be compared to a saint?"

"I wonder if Lu Ban can be regarded as a half-saint?"

"Okay, okay, this?? Yes, there can be. The old man said weakly, and he suddenly realized that he seemed to have neglected too many things, and this little fellow gave him a sense of sudden enlightenment.

"I think this book is very interesting, I wrote it, hehehe??" Lu Chen took out a small book and handed it to Pang Degong.

"The Theory of Heavenly Evolution".

Pang Degong was curious when he saw the title of the book, and when he opened it, it was actually the story that Lu Chen told him before, who changed from monkeys, and of course, it also involved other animals, such as the domestication of horses and dogs, the evolution of grains, etc.

"This is also one of the subjects?" Pang Degong looked disgusted.

"Ahem??" Lu Chen's face flushed, "This is an elective course, students can choose to take it, or they can ignore it." ”

"That's pretty much it." Pang De saw a small word "selection" on the cover, and Gong decisively pushed "The Theory of Heavenly Evolution" aside, reached out and grabbed the bookbag in front of Lu Chen, and looked through it himself.

Lu Chen was speechless, what do you mean that this is about the same? If I didn't think this thing was too advanced, it would have become a compulsory course, and after a few decades of development, maybe it would have become a biology major!

"Chemistry? What is this?? Oh, isn't this the alchemy method of alchemy? Pure nonsense, this is also an elective? Pang Degong's eyes were about to fall, and then his face changed, "The gunpowder comes from Fangshi Alchemy?" Cement is also a chemical product? And glass? Is the quenching and carburizing technology of iron also chemical? What kind of chemistry does salt have to do with this? Rice cooked too? Can you talk more nonsense? Not! Can it be used in pharmaceutical preparations? This one?? Yes, there can be. ”

Lu Chen grinned and laughed dryly, and suddenly felt that this old man was very funny, not the kind of person who couldn't eat the ancients, and that's good.

"Ouch! Is this a compulsory subject? Jurisprudence? From the Legalists? How does this work? How can Confucianism be mixed into the mean and cruel scholarship of Legalism? However, the law of the country is like the sky, and it cannot be wasted. Yes, there can be. ”

"Huh?" The old man's ass twisted twice, "Geography? This, this, this?? Yes, there can be. ”

"The Art of War? Take? This can be had. ”

"Astronomy? Take? Astrology is not reliable, the old man never watches the sky at night, etc., so that's the case? It's quirky, but you can have it. ”

"Gewu? This one?? Something abrupt, right? Also, it seems to coincide with the number of operations and chemistry. What's more, this is still mandatory? The old man finally found Lu Chen's "loophole".

"It's different, I think it's necessary to find out the reasons for everything, and it also helps to promote the progress of knowledge. For example, why can wood be attached to the water, but the stone will sink, so we built a boat, after tracing back to the origin, we can even build an iron boat, there is a model of an iron boat in my yard, the people of Jiangdong have seen it, frightened, the old gentleman can also go to see it, this thing is called 'buoyancy'. Furthermore, why birds can fly in the sky, after figuring out the reason, we humans can too, and that principle will be different from the simple hot air balloon in Yanmen. At that time, the flying plane could fly higher and faster, perhaps, from Yanmen to Jingzhou, it only took an hour, and the moat became a thoroughfare! And??"

"Alright, this can be there too." The old man patted his head, apparently stunned.

"Then the old gentleman will rest first, tomorrow, I will ask Shi Yuan to pick you up and take you to the academy, from tomorrow onwards, you will be the head of the academy." Lu Chen smiled.

"When did the old man agree?"

"You have finalized the subjects, this is the right and duty of the court, could it be that the old man is ready to repay the debt? This can be there! ”

The old man glared at Lu Chen fiercely and said, "Let's go, leave all the books behind, and I'll do it again?" Discretion. As he spoke, he blasted Lu Chen out of the door, and went back to the house to study those strange textbooks, not to mention, it's quite interesting, for example, the light in "Gewu" travels in a straight line, and the sound will bounce back to form an echo when it encounters obstacles, for example, in "The Theory of Heavenly Evolution", it is said that the crucian carp is domesticated and each time the colored crucian carp is picked out to mate and raised, and many times it is selected and cultivated, and finally a special fish species will be formed, well, this can be tried. Also, "Chemistry" says that water is made by the combination of two gases, which is nonsense, but it is true that salt can be separated from seawater. The most amazing thing is that what is the principle of leverage mentioned in "Construction Machinery", stone throwers and hoes, and even scales are this principle, think about it carefully, it seems to be right, why don't you usually pay attention to these?

"Sir, everything is packed and it's time to go."

The servant carried a load of luggage, long and short on one side, with heavy bamboo slips on one side and light clothes on the other.

"Well, that's the lever principle." The old man looked at the servant and nodded, obviously poisoned too deeply. (To be continued......)