Zhou Nan has always believed that China's civilization inherited for more than 3,000 years is a real and all-encompassing civilization, although China is outdated in the stage of industrial society. However, we must not erase the glorious civilization created by our ancestors and its continuous enlightenment of modern society. Just like the Yin and Yang doctrine and binary are similar and close in nature.

Although ancient Chinese society did not develop a medical system like Western medicine today, let alone produce penicillin. However, this does not prevent the invention of a penicillin-like drug - gold juice in traditional Chinese medicine for thousands of years.

To make gold juice, most of them use the feces of 11 or 2-year-old boys, and the feces of a month before and after the winter solstice are chosen, because at that time people's physical condition is relatively good, and the feces are not easy to deteriorate. Five buckets of good well water or spring water must be added to the beaten puree, stirred evenly, and then filtered through bamboo sieve and gauze, and then the liquid can be loaded into the clay pot, and then a small bowl of licorice water is added, and finally the clay pot is covered with a dish, sealed with red clay, and buried in the soil two meters deep. The longer it is sealed, the better, and it will take at least ten years to use it. It's been a long time. After taking it out, the liquid in the crockpot will be divided into three layers, and only the top layer of clear liquid is the golden juice.

The gold juice is slightly yellow, non-toxic and tasteless, and it is extremely effective in treating heat and dampness and clearing heat. The main effect of gold juice is to clear away heat and detoxify, cool blood and eliminate spots. He is a master of using gold juice in various infectious diseases such as heat, heat, dampness, epidemic, spotted rash, scab, acne chancre, etc.

Later generations of famous doctors mostly used gold juice for warm and damp heat epidemics, and even diphtheria, which has a very high mortality rate, can also be cured with gold juice. It can be seen that the efficacy of gold juice is similar to that of antibiotics in Western medicine.

To explain it in modern science, actinomycetes in laterite can be fermented and cultured to produce antibiotics in the fermentation broth, which may be one of the factors in the curative effect of gold juice.

Therefore, although there are no nylon materials in later generations, Zhou Nan still thought of similar methods and materials around him that can be used to make hot air balloons, but this needs to be verified with real objects.

Zhou Nan looked at the cowhide balloon that was gradually bulging in the middle of the yard in front of him, and couldn't help grinning - it seems that the first layer of cowhide can be used as a hot air balloon.

The balloon gradually unfolded, and there was no longer a need to hold it up with a wooden stick.

Zhou Nan asked the craftsman to take out the wooden stick, and without the suppression of the craftsman, the willow frame was fluttering and wanted to leave the ground. Zhou Nan asked a craftsman to hold down the willow frame, and asked the blacksmith to burn the fire and continue to increase the heat.

The cowhide balloon was eventually completely propped open by the hot air, and the tendons stuck to the opening of the balloon pulled the willow frame so hard that the craftsman who was holding the willow frame had to press his body to hold it.

The craftsmen in the yard all looked at the balloon in amazement, and in their opinion, they could vaguely see that this cowhide balloon could be unfolded, rounded, and had the strength to pull the willow frame, which must be related to this small iron stove, but they didn't know how the iron stove could open the balloon.

Conniving at the "Book of Luban", he was able to make a wooden bird flying into the sky, and he also relied on the secret skills in it, but Zhou Nan actually just commanded everyone, and with a few ordinary things, he could make the willow frame go to the sky.

The balloon has tendons attached to the willow frame, and the willow frame is pressed again, so it just flutters slightly in the yard with the wind. The charcoal fire in the small iron furnace gradually weakened, and the blacksmith continued to add charcoal, but was stopped by Zhou Nan. It has been verified that the cowhide balloon can be made into a hot air balloon, and there is no need to continue to burn the fire.

After this trial production, if you want to make a manned hot air balloon, you must make a larger balloon, and there is another point, Zhou Nan just noticed that the balloon made of cowhide is not as airtight as nylon, and it has been burning and inflating just now, but the balloon is not very tight, Zhou Nan also tried to poke the balloon with his hand, and the outside of the balloon is also hot - the cowhide itself is hot, and the cowhide itself because of the fine air holes, it will naturally emit heat through these air holes.

As long as there is enough material, a larger balloon can be made. However, the breathability of natural cowhide itself has become a problem here.

Zhou Nan also thought about using fish maw glue or lacquer, tung oil and the like to apply it to the balloon, but that would inevitably make the balloon hard, which was not conducive to storage, and he couldn't go anywhere, so he sent dozens of people to carry this balloon that couldn't be folded, right?

Seeing that Zhou Nan was frowning and thinking hard, these craftsmen were silent, not daring to disturb Zhou Nan.

Zhou Nan really had no choice, and tried to ask: "Do you know, how to make this balloon not leak?" ”

He didn't have much hope, but he saw a cobbler stand up and say, "The little man knows, donkey." ”

Zhou Nan couldn't help but be overjoyed and said, "Let's talk about it, how to make the balloon breathable?" ”

But the craftsman looked left and right, but did not answer. Only then did Zhou Nan understand that this leathersmith probably had an exclusive way, but he couldn't talk about it in front of others.

Zhou Nan first said to the craftsmen in the courtyard: "I think you have already understood, what I want you to do is how to make a balloon that can lift the willow frame and two people." With this little balloon, you should know how to do it, right? ”

The craftsmen in the courtyard all responded: "The little people know about it." ”

Zhou Nan reminded again: "Next time, you must think of setting up the balloon before the fire is drummed, so as not to burn the balloon; The tendons should also be strong and not broken; The mouth of the iron furnace should be fixed, and the opening of the balloon should not be burned. ”

The craftsmen agreed again, Zhou Nan nodded, and said, "Then please discuss it together and start making it." He took with him the cobbler who kept the balloon from leaking.

When he came to his room, Zhou Nan asked, "I don't know what you can do to make the cowhide balloon not leak?" ”

The craftsman replied respectfully: "The horse is a noble person, and he will never learn the master's craft, and what the villain says, it is not a violation of the teacher's training." The villain master once said that if you use cowhide to wrap things, you must tighten the cowhide and not be deflated, so as not to make insects eat the things in the package. The way to tighten the cowhide is to soak it in boiling water with gallnut. Gallic is a traditional Chinese medicine, its sexual astringency, soaking the cowhide, can make the cowhide tight, not deflated. ”

Zhou Nan was overjoyed and said: "From today on, you will dedicate this matter to you, and you will first concoct it before the cowhide is made into a balloon; Whatever you need to use, you can go to the crude medicine shop in the city and choose it yourself, and as long as you do it, I will reward you with it. ”

The craftsman knew that Zhou Nan's arrangement was also to prevent him from revealing his unique secret method, and he couldn't help but say gratefully: "The concubine understands the villain, and the villain will do a good job for the concubine." ”

Zhou Nan comforted a few more words before letting the leatherman go down to do errands.