If you splash water directly from a high place, you will definitely not see the rainbow, and you must make the water into a mist to see a beautiful rainbow.

Foggy water vapor is a necessary condition for the production of rainbows, which is also to create a real environment after rain, to produce foggy water vapor, the simplest and most convenient way is to let a person take a mouthful of water in their mouths, and then spray towards the sun, so that you can see the colorful beautiful rainbow for a short time.

However, the rainbow seen in this method is too small, and the duration is too short, which is not conducive to observation, and what Li An has to do is to create a truly beautiful big rainbow, so that everyone can see it clearly, and it is to continue to see, so that it is necessary to use the machine, and this machine, Li An naturally has, this time in order to go to class, also brought two over, at this moment, has been taken to the high places on both sides of the yard by two assistants, and there is still enough water by the way.

This machine is actually a very ordinary water gun, which was found in the shops of car washes in later generations, and the speed of the water jet is very fast, and it can clean the dirt on the car with impact.

Because of the high pressure, this water gun can also make the water beam into a very dispersed mist, which is very conducive to artificial rainbow experiments, so Li Na brought this water gun to the classroom.

The high-power water gun must be electric to be effective, and the manpower-driven water gun is a toy, and there is naturally a power interface here, so there is no pressure to do such a laboratory.

"The sun is dazzling today! Can we really see rainbows? ”

"Whether you can see the rainbow or not, we'll know later, anyway, I can't wait long."

"I said, if you really see a rainbow, wouldn't that mean that what Li Shilang said is right."

"What does this have to do with it, it's just some tricks and tricks, how can it be compared with poetry and book etiquette."

"That's true, but, right now, my Datang really needs these tricks! Now go out and get on the train, not to mention how stable it is, going to Luoyang City, it's only a matter of one day, if this is left behind, it will take half a month? The bones are all upside down! ”

These old guys, standing behind all the emperors and grandchildren, talked in whispers from a certain distance.

Unlike these old guys, the emperors and grandchildren who walked out of the room all had very excited expressions, and they were all waiting for a miracle to appear.

Li An glanced to the sides and saw that the two assistants were ready, so he nodded and asked the assistants to start working immediately, while he himself looked at everyone and said, "The show is about to start, everyone is ready to watch the play!" ”

After speaking, the two assistants had already activated the water cannon and sprayed water in the direction of the sun, and the diffuse water mist almost blocked the sunlight, making the whole yard a lot cooler all of a sudden.

"Rainbow, there really is a rainbow!"

"Rainbow, I see a rainbow, it's beautiful."

"Sir is really good, he can make rainbows."

These young emperors and grandsons all shouted very excitedly, such a beautiful scenery, how could they not be excited, this is a real rainbow! Moreover, it is semi-circular, exactly the same as the rainbow that they usually see after the rain, and this makes their hearts extremely excited.

"Rainbow, really made a rainbow, a rainbow that has been around for thousands of years, it turns out that it's that simple?"

"It is said that the rainbow is a bridge between the world and the sky, so you can get it out this way, it's too simple!"

"What is this, some people say that rainbows are insects in the sky that eat water droplets?"

"Looks like these are all rumors! You can see a rainbow by spraying a little water, so there is nothing unusual about rainbows. ”

"Anyway, today is an eye-opener, not in vain! Even though it's just a trick, I still enjoy these classes, I just can't indulge in them every day. ”

Several of the old fellows started talking again, their expressions looking very excited.

At this moment, Li An walked over, looked at the eight old guys, and said, "Are you quite satisfied with my experiment?" What do you think? ”

"Okay, it's very exquisite, Li Shilang is really amazing, he can find out the reason for the rainbow, this is really amazing, we are ashamed of ourselves!"

"Yes! Oh, yes! It was also the first time we knew that the rainbow after the rain was created in this way, which was really amazing. ”

"It seems that as long as the water has been spraying like this, the rainbow will always exist, it's amazing, I've lived half my life, and I've been deceived for half my life!"

Several old guys are very knowledgeable about current affairs, and they all praise Ang Lee's ability.

Li An was humble for a moment and said, "It's nothing, it's just a trick, hahaha!" By the way, if the conditions are not good, in fact, if you spit out a bunch of water in your mouth, you can also see the rainbow, but the effect is far less spectacular than the rainbow made by the water gun. ”

After speaking, he walked to the emperors and grandchildren, and said loudly: "Is the rainbow beautiful?" ”

"Good-looking, good-looking, hahaha!"

In such a depressing environment as Baisun Courtyard, these imperial grandsons probably haven't laughed so happily for a long time.

However, not all the emperors and grandchildren are happy, there are always so many children, who are always sullen and worried, which is very inconsistent with their age, whether it is a serious precociousness, or has suffered something that should not be experienced at this age, this Li An is not easy to judge.

However, there is an interesting phenomenon, that is, the favored and high-status emperors and grandchildren are in a very good mood, and those sullen emperors and grandchildren are all unfavored children, according to the words of later generations, unfavored children are like stepmothers raised, no one loves them, it is really pitiful.

Li An took a look, and the one with the most depressed expression was Li Huai, the eldest son of Li Mao, the eighteenth son of the emperor, this kid is not very old, but he looks like he is bitter and hateful, and he is not serious about listening to lectures, and his mind wandering is his normal.

It's no wonder that this kid is, after all, his father Shouwang Li Mao is the most unlucky prince in the Tang Dynasty, a prince who was cuckolded by his father, and the tighter this hat is, the emperor is more and more fond of the concubine, and Shouwang Li Mao's mood is naturally more and more depressed.

Although, in order to compensate for his son, the emperor chose a woman among the Wei clan in the capital to give to Li Mao, but this could not make up for the bitterness in Li Mao's heart, the Wei family was okay, but how could it be compared with a small like Yang Yuhuan, and this is a man's self-esteem problem.

The pressure in a person's heart is too great, it needs to be vented, Li Mao does not dare to vent at will in other aspects, but on the belly of Wei's given to him by the emperor, it is a vent, and within a few years, Wei's pregnancy and childbirth are carried out one after another, which can be regarded as masculine, so that all the people who laugh at him behind his back can see how good he is, so that his wife can conceive children one after another, although this kind of display cannot completely eliminate the depression in his heart, but it is also beyond his control.

Li Huai, the child, was made on Wei's stomach when Li Mao was depressed, and some people said that when he was depressed, the child who made it was also depressed, and Li Mao's eldest son, Li Huai, was obviously born in this situation.

The birth of this child is not a product of love, but the crystallization of his father Li Mao's grievances and resentment, and the congenital birth environment is not good.

And after being born, the growth environment was even worse, because his father often frowned and sighed, which naturally gave Li Huai a melancholy temperament in his young heart.

If you live with animals, after a long time, you will begin to learn various behaviors of animals, such as wolf children, because children stay with wolves for a long time, over time, they will begin to learn the words and deeds of animals, and it will be difficult to change when they grow up, and in the future, they are afraid that they will stay with wolves for the rest of their lives.

Family atmosphere is very important for a person's growth, the behavior and temperament of family members will seriously affect a child's life, Li Huai has lived in the environment since he was a child, there is no laughter, so he naturally doesn't know what happiness is, and he can't laugh, and he can't laugh.

When he was a little older, he seemed to know something, although he didn't understand it very well, but he knew that his father had been greatly wronged, so he became so melancholy, and at the same time, he felt that he was an outcast, an outcast who no one loved and no one loved.

Li An and Li Mao are not very familiar with each other, although they are somewhat sympathetic to his plight, but they really can't help much, after all, the emperor can't let the emperor return his favorite concubine to his son! This is obviously very unrealistic.

As for Li Huai, a child, Li An can help a little, for example, take advantage of the opportunity of class, ask a few more questions, make him smile when he is fine, or something, slowly may be able to change Li Huai's melancholy personality and make him gradually become cheerful.

As a good person, Ang Lee firmly believes that every grass will bloom, any child is hopeful, and can not easily give up any child, to nourish the wounded hearts of these children like sunshine, so that they can believe that the world is beautiful, so that they can grow up happily, and should not live a depressed life.

In addition to these imperial grandsons who attended classes, there are many imperial grandsons who did not come to class, and they are all older, such as the children of Li Yu, the king of Guangping, who have come to school, so naturally he can't come with him, and the father and son attend classes in the same class.

But after the rainbow appeared, these emperors and grandsons, who had nothing to do, all gathered, and even many servants came to watch the excitement.

"Rainbow, it's a rainbow."

Everyone exclaimed in amazement, as if the future generations had seen aliens.

"Father, look, there's a rainbow."

Li Shi saw his father coming over, and hurriedly ran over excitedly, pulling his father to watch the rainbow together.

Li Yu touched Li Shi's head, smiled, pulled Li Shi to Li An, and said respectfully: "It's only been a few years of hard work, and Li Shilang has started to teach my Shi'er, time flies so fast!" ”

What he said was a few years ago, when he and Shiro learned from Li Ang, in fact, Li Ang didn't teach him anything, just took the two of them to see rare things in the R&D center, and occasionally introduced them, but he was not his teacher, and at this moment, when Li An taught these imperial grandchildren, he was educated according to the standards of the classroom of later generations, and he could be regarded as a teacher.

"What King Guangping said is that this time is several years, and now Shi'er has reached the age of learning, Shi'er is very smart, very naughty, and looks very cute."

Li An also touched Li Shi's head and said with a smile.

Immediately afterwards, there were many older emperors and grandsons, who came to greet Ang Lee, and their words were very respectful, after all, everyone understood the weight of Ang Lee in Datang, although they were all grandsons and grandsons of the emperor, but there were so many grandsons of the emperor, one more was not more, and one less was not less, and Ang Lee was the only great talent, Datang could have a few fewer grandchildren, but there must be no peerless talent like Ang Lee, so they naturally did not dare to offend Ang Lee.

The generation of the rainbow is based on water vapor, that is to say, as long as the water mist is constantly sprayed with a water gun, you can always see the rainbow, but the amount of water carried by Ang Lee's two assistants is limited, and there is always a moment when it is used up, so the rainbow will gradually disappear after the water is used up, and the moment when the rainbow disappears is the moment when Ang Lee leaves Baisunyuan.

"The rainbow is gone, it's time for me to go home, everyone stay, stay."

Li An politely said goodbye to everyone one by one and left Baisun Courtyard.

It's still quite interesting to teach the royal grandchildren, at least, looking at the adoring expressions of these little guys, Li Ang has a great sense of accomplishment, and this feeling makes Li Ang very comfortable.

However, because Ang Lee still has work to do, it is impossible to take such a course every day, five or six days a month is about the same, according to the standards of later generations, that is, one class a week, it is very easy.

In this era of Datang, because many things are monopolized, this leads to a lot of unfairness, but at the same time, there is also an advantage, that is, in high-end learning, the competitive pressure is not very great.

Since ancient times, there have been many scholars who have not been able to get into the examination for fame in their lives, which can be described as a regret for life, but compared with the college entrance examination in later generations, it is too far behind, and the degree of competition is estimated to scare to death these ancient literati who only use the etiquette of reading poetry and books, so the literati of the Tang Dynasty are still very happy, and their competitive pressure is much less.

The emperor asked Li An to go to Baisun Academy to give lessons to the emperors and grandchildren, probably with the intention of letting these emperors and grandsons understand science and increase their knowledge, not really to let these grandsons learn like Li An.