Lu Hanyang was originally not going to say these things, after all, people are selfish, and he was ready to take it out little by little, so that his reputation would always exist, and even be a savior or something a few times.

For example, the defense of smallpox, planting cowpox is very simple, but smallpox is the most terrible plague in this era, and the people who died are not the worst, but the most miserable are those who survive.

People are not ghosts, they can only wander outside the crowd, and then wail day and night, and finally end themselves.

There is also gunpowder, which is a big killing weapon when taken out, which can make the entire Tang Dynasty invincible. But this thing is a tiger out of the cage, and after it appears, it will definitely not stop according to Lu Hanyang's vision.

The appearance of gunpowder weapons will definitely cause the war in this world to enter the era of hot weapons in advance, and although Lu Hanyang himself is not afraid, the killing caused is definitely not small. The golden finger on his body now belongs to the category of cultivating immortals.

This kind of most emphasis on cause and effect, merit and karma, etc., if the gunpowder kills people are counted on his head, then he doesn't need to cultivate immortals.

Of course, in this era, there was already a rudimentary form of gunpowder, and Taoist alchemy was blowing up the furnace at any time. But the best match thing is still proposed by myself, and I don't know if it will be recorded in a small notebook.

However, after thinking about it, he still decided to take out all these things, after all, gunpowder can kill more enemies of the Tang Dynasty and save the lives of more soldiers of the Tang Dynasty. And these soldiers are also the people of the Tang Dynasty, who are soldiers in war and farmers in their spare time.

"Now go to the apse with the main seat, and as for the samurai wok, you can go back!" As he spoke, Lu Hanyang took Xiao Wu and Li Lizhi in front of him and went to the apse.

Yuan Tiangang wanted to follow, but was glanced at by Lu Hanyang's eyes, and he suddenly didn't dare to move. He is also a man of knowledge, some of these things can be heard, and some of them really can't be heard.

He stole saltpeter ice before, and Lu Hanyang didn't care that Yuan Tiangang knew about it, but this gunpowder was not something that Yuan Tiangang could touch.

"Thank you, Immortal!" Li Er followed behind Lu Hanyang, and then went directly towards Lu Hanyang's residence behind.

This is where Lu Hanyang, Xiao Wu, and Li Lizhi live, although it is a big house, there are few of them. Other Taoist priests were not qualified to live in the apse, they all lived in the wings on the left and right of the front hall.

Although Yuan Tiangang and Li Chunfeng have a special status, they just live in a single room, and it is impossible to come to the back.

The back is the shape of a three-sided walled city, and the front hall forms a mouth shape, and if you add the left and right wings, it is the same as the Japanese character missing the bottom of the horizontal line.

Lu Hanyang and the two little Lolitas are living on three sides, anyway, they live in every room, and the house that no one lives in for a long time will gradually become deserted, even if there are people living next to it. This is the so-called popularity, and Lu Hanyang is going to find a few more people to be more popular.

Of course, if you want to find a few more people, it is Mrs. Zhai, and you will definitely not look for children, a little Wuxiong child is enough.

Walking into the apse, the meat ball of the roe squatting at the door ran over, this is a big dog, the whole body looks similar to the Tibetan mastiff, and the mane on the head is like a lion.

"Let's play! I don't have time to mess with you right now! Lu Hanyang said, and then went directly to the main room in the middle of the apse.

"This seat says, you write it yourself!" After sending the two children to play with the meat ball, Lu Hanyang and Li Er entered the study, and said after the pen, ink, paper and inkstone were ready.

"Immortal Chief, please give me, Xiao Ke listens!" Li Er picked up the pen.

"First of all, let's talk about war horses, this kind of thing is actually very simple, just put shoes on the horse!" Lu Hanyang said.

"Shoe the horses?" Li Er was surprised, what kind of method was this. Have that kung fu to put shoes on horses?

"It is to nail a layer of iron plate to the horse's hooves, of course, not whole, but like a crescent moon, but the two sides are not arcs but straight, and they are longer!" As he spoke, Lu Hanyang directly used his sword qi to draw the shape of a horseshoe directly on the ground.

"Just make four holes in this and nail it on the horse's hoof, which has a very thick cuticle on top of it, and the nail is shorter, so you don't have to worry about stabbing the horse's shoe." Lu Hanyang said.

"Sure enough, it's a whimsical idea, so that the horseshoe won't wear out, it's this iron plate that is worn, and if you consume more, you can replace it! Sure enough, it's a good way! Li Er understood and praised.

"After that, it is to treat Lingnan fever, Artemisia annua can be used, and Artemisia annua can be prevented by boiling water and drinking it. I don't need to write about this, it's very simple anyway. Lu Hanyang said.

"Immortal Chief, it's better to write it down, lest if you forget it, it will be a sin!" Li Er stubbornly wrote down the words of Artemisia annua to cure fever.

"After that, it's printing, and now there's engraving printing, which costs a lot, right?" Lu Hanyang asked.

"Yes, Immortal Chief, the cost of printing is all on the engraving." There is a master of engraving and printing in the palace, and Li Er is very clear about the cost geometry.

"You have a seal, don't you? With a few more stamps, is it possible to change various characters at once? For example, if the four seals are engraved with plum orchid chrysanthemum, can they be arranged out of plum orchid chrysanthemum, plum chrysanthemum, bamboo plum orchid chrysanthemum and so on? Lu Hanyang said.

"This is indeed possible!" Li Er replied.

"So, if all the words are carved into a seal, the commonly used words are carved more, and the rare words are less, and if you want a book, you can find it directly, and then frame it with a frame, and it will become an engraving, right?" Lu Hanyang asked.

"This ...... Indeed it is. Li Er suddenly realized.

"How about changing the material, not with the stone, but with the clay? Is it okay to carve the font and then fire it into something like porcelain? As long as you find the right ink, can you print books directly? And it can also be carved into a male version. Lu Hanyang said.

"The immortal chief's words made Xiao Ke Mao suddenly open! Sure enough, everything is so simple. Li Er wrote down this printing technique as he spoke.

"Let's talk about sores, which is a very deadly infectious disease, the plague. However, there is research in this area in the wilderness, and cattle can also get smallpox, and smallpox in cattle can also be transmitted to people. Lu Hanyang said.

"How's that for good? Or kill the cow! "Li Er is as afraid of smallpox as a tiger, he once passed by smallpox, at that time the army crossed the border, almost fell into it, if it wasn't for the scouts, he might not be here.

"What cow to kill? Not only can you not kill cows, but you must vigorously cultivate such cattle infected with smallpox, cow smallpox is not fatal in people, it will only make people have a low-grade fever for two days, such people will not get smallpox in the future! The emperor can let Sun Simiao preside over this matter! Lu Hanyang said.