Uncle Wang, Zhao Qian, and Fengling were all immediately restrained. How long has it been since then? Why is the imperial court issuing a reward again?
Uncle Wang looked at the stack of banknotes and two paintings in Li Yu's hand and said excitedly: "Sir, you really amaze us, 5,000 taels!"
Li Yu said, "You can brag about 5,000 taels, but try not to tell these two paintings."
"Are they worth more than 5,000 taels of silver?" Zhao Qian also asked.
"It's hard to say now, but in the future there will be no comparison." Li Yu said.
Uncle Wang and Zhao Qian were shocked: "That's the treasure!"
Fengling was trained in chess, calligraphy, and painting in the brothel. She laughed and scolded: "Don't embarrass yourself in front of your husband! Our master is an educated man. Can you learn more in the future? You will embarrass him even when you go out." .”
Uncle Wang and Zhao Qian both said yes: "Please ask Miss Fengling for your advice in the future!"
While several people were talking, a beeping sound came from the east wing.
Uncle Wang said: "Sir, it's your black box again. Why does it keep ringing?"
Li Yu pointed to the tall telegraph wire outside and said: "The telegraph wire set up outside the house is for it. This is called a telegraph machine."
Li Yu came to the east wing and translated the message through Morse code. It was sent from the Royal Academy of Sciences. The sender was Lord Kelvin:
"Mr. Li Yu, I am surprised to hear that you won the mathematics award in Sweden and published a mathematical book. I would like to express my deepest congratulations. I hope you will write another manuscript for us! I look forward to it very much!"
Okay, this is jealousy.
But Li Yu happened to have something to send. He didn't just stare at the Siberian wilderness every day on the train.
Li Yu plans to return to his hometown of physics this time and publish an inspiring article.
Inspired by nature is one of his strongest areas, quantum mechanics.
However, he also understood that this process would be very long, and he should not be too reckless at the beginning. After all, Planck had introduced Planck's formula as early as 1900, and no one is paying attention to it until now.
——Quantum mechanics is too complex and needs the nourishment of soil and time.
He thought for a long time before he came up with an ingenious starting point - discussing why magnetism occurs.
This question also belongs to the category that seems very simple but is actually very profound.
Because if you want to explain why the magnet attracts iron, you need to use quantum mechanics in the microscopic field!
Therefore, it is also a perfect example of a common life phenomenon that hides a great truth. It is very suitable to be written as a paper. It can have a certain explosive point and will not be left out, otherwise it will lose the significance of inspiration.
In this era, through the efforts of a bunch of experts in electricity and magnetism, everyone already knows the existence of electric charges, so it is speculated that the magnetism of magnets is also due to the existence of "magnetic charges", which are similar to electric charges.
But this is definitely not the case in fact. Otherwise, according to this theory, one side of the magnet has positive magnetic charges and the other side has negative magnetic charges. If the magnet is not paying attention and is suddenly cut off in the middle, it will become a case where both sides have positive magnetic charges. Is there a negative magnetic charge on one side?
"Magnetic monopoles" that are like positive and negative charges have appeared (just for example, it does not refer to the magnetic monopoles predicted by Dirac, and this has not been discovered).
But in fact, no matter how many times you cut it off, the magnet will quickly re-form the North and South Poles.
So "magnetic charge" does not exist, only electric charges exist.
Electric charges create an electric field, and the relativistic effects of the electric field create a magnetic field.
Anyone who has studied junior high school physics understands that electricity generates magnetism, magnetism generates electricity, and electromagnetism is a family member.
To explain why the magnet can attract iron, we must penetrate to the microscopic level: a few years ago, electrons were discovered. Everyone knows that particles are charged, and the movement of charged particles generates a magnetic field.
The famous nuclear magnetic resonance actually uses these principles.
In short, the magnet has so-called "magnetic chips" formed by microscopic particles that are arranged neatly in a certain sense, thus forming a magnetic field.
As for iron, cobalt, nickel, etc., there are "magnetic chips" arranged in a chaotic manner.
When the magnet is close to the iron, cobalt and nickel, the magnetic field lines will straighten out the chaotic magnetic chips in the iron, cobalt and nickel, and then they can attract each other.
So in essence, the magnet attracts iron because of the interaction between magnetic fields: it first turns you into a magnetic field, and then attracts you.
Although this paper is not long, it actually uses microscopic models.
Of course, Li Yu won't explain it too clearly. He just needs to explain the truth. As for how it will develop later, he doesn't need to worry too much.
Li Yu was very satisfied with this short paper and was ready to send it out immediately.
Li Yu walked out of the door, just as Zhao Qian came back happily pulling Fengling. Fengling was holding some cheap rouge, gouache, combs, mirrors and other items that she had just bought.
Fengling said: "Not to mention, this newly opened market is really full of everything."
Zhao Qian scratched his head and said, "I'm sorry, Fengling, I can only buy you these bargains, which are not as good as your previous ones."
Before Fengling was in the land of fireworks, the paint she used was of the highest quality.
Fengling said: "Don't say that!"
Li Yu came over and said, "From now on, when you buy daily necessities, clothes, shoes and hats, just buy them and ask me to reimburse you after you buy them."
Fengling said: "Sir, that's okay! It's just clothes. These rouges and gouache are not necessary for a maid."
Li Yu smiled and said: "As you said before, we can't lose the face of our Li family. You must dress better in the future."
Fengling and Zhao Qian said gratefully: "Thank you, Mr.!"
Li Yu said to Zhao Qian: "Let's go out and go to the Qing Post Office to send letters."
"Come on!" Zhao Qian took out a towel and wiped the car seat. "Sir, please get in the car and let me take you through the streets of Beijing!" "
Zhao Qian was very fast. When he finished sending the letter and walked back, he did not forget to tell Li Yu what was new: "Sir, do you know that the Dong'an Market has just opened in Jinyu Alley, and it is very lively. Feng and I Ling is the rouge and gouache I bought there, it has everything you want."
Dong'an Market is the earliest comprehensive shopping mall established in Beijing. It is located next to today's Wangfujing. After more than a hundred years of vicissitudes, it is still alive.
Li Yu became interested: "Let's go and have a look!"
When passing by Jinyu Hutong and Dong'anmen Street, the familiar street vendors were gone, not even the Ding Deshan stall where Li Yu often went to eat noodles.
"Both sides of the road are really clean." Li Yu said.
Zhao Qian said: "Yes, sir, I heard that because it delayed the official's entry into the palace, Natong Shangshu, who lives in Jinyu Alley, drove all the vendors to Dong'an Market."
Dong'anmen is the only way for officials who live in the east city of Beijing to go to court. More and more vendors are blocking the road along the street, making it difficult for cars and horses to pass through sometimes. Every day is like going to a market.
"It's not a bad thing to gather them together and form a shopping mall." Li Yu said.
Zhao Qian said: "At the beginning, many vendors were reluctant to come, and some ran away to the temple fair. However, the market became more and more prosperous, and vendors came naturally."
Today’s capital does need a big market. When the Eight-Power Allied Forces captured Beijing in 1900, the large fence outside the front gate was burned to rubble. The traders inside used to wander around in the past two years, but now they have a place to stay and quickly moved to Dong’an. market.
Li Yu walked inside. The newly established Dong'an Market was very simple. There were street vendors, people setting up tents, and people pushing carts.
But it’s easy to choose if you gather together. After all, they sell everything, including snacks, groceries, vegetables, fruits, clothes, shoes and hats, etc. Most of them are small stalls.
Li Yu found Ding Deshan in the market, walked up to him and asked, "How is business lately?"
"Hey! Sir, long time no see!" Ding Deshan said, "You can see that the business in the market is quite good. Regular customers also know me and come here. Now many stall owners from other places also eat me. Boiled noodles. Would you like a bowl of noodles, sir?"
"Make me four bowls of noodles and take them away," Li Yu said.
"Okay, please wait a moment, sir!"
Li Yu saw a green ticket under Ding Deshan's money box and asked, "What is this?"
Ding Deshan said as he walked down: "After paying the land fee, the market will give you a ticket. If you don't have it, you will be kicked out by the patrol station."
Li Yu pointed around and asked, "Do all stalls have tickets?"
Ding Deshan said: "Both are available, but they are different. Sir, look at my green ticket. It is specially issued to a stall that covers an area of 10 feet. It costs 70 Wen per day. If the stall is only five feet square, it is a pink ticket. , 40 Wen per day. I heard that there are larger stalls that are more than 1.5 feet tall, which cost 110 Wen, and a green ticket and a pink ticket will be issued."
Li Yu said: "I didn't expect the management to be quite strict."
"Isn't that right!" Ding Deshan continued, "The tickets are collected at the market close every day, and you have to buy new tickets when you come the next day."
Li Yu said: "Then they really save on tickets. They only need these tickets and send them back and forth every day."
Ding Deshan packed four boxes and said, "My guest, your face."
Zhao Qian took it and said to him: "I will bring the box back later."
Someone behind Li Yu saw this and shouted to them: "Beef noodles with fried belly are a perfect match. Guest, please order another fried belly!"
Ding Deshan said to Li Yu: "My lord, he is Wang Fukui, the 'King of Buried Belly' in Dong'an Market. Although the price is not cheap, the taste is not good. "
"Since it was recommended by you, I must try it," Li Yu said to the "Burned Belly King", "Bring me four portions of the fried belly."
Wang Fukui yelled: "Come on! Four portions! A total of 80 pieces."
It’s very filling and very affordable.
Wang Fukui was the first generation of "explosive belly king", and then the second generation "explosive belly king" Wang Jinliang directly developed into a businessman and established the brand name "Xi Deshun".
This is a century-old brand that continues to this day. Hou Baolin will say in his acapella and storytelling: "When you go to Dong'an Market, there is Xi Deshun..."
Of course, not only Xi Deshun, there are many century-old brands born in Dong'an market, such as Daoxiangchun and Baodu Feng, which have been passed down to this day.
The bean juice seller next to him saw it and greeted him: "Sir, please have some bean juice too!"
Li Yu's heart trembled. He really couldn't drink the bean juice.
Li Yu asked Zhao Qian to pick up the stuffed tomatoes. When he was about to go home, he suddenly saw something "fresh" and asked, "Shopkeeper, how do you sell your tomatoes?"
"This is called foreign persimmon. It's very delicious." said the shop owner.
Li Yu smiled and said, "Okay, then weigh ten catties of foreign persimmons for me."
Zhao Qian took one look and said, "Sir, what is this?"
"A kind of vegetable, delicious and nutritious." Li Yu said.
Zhao Qian looked at the red fruit and said, "It looks like it's poisonous. Can I eat it?"
Although tomatoes were introduced to China as early as the Ming Dynasty, the scope of their influence has been very small. By the late Ming and early Qing dynasties, few people ate them.
The large-scale planting and promotion of tomatoes will have to wait until sixty or seventy years later.
Li Yu said: "Of course you can eat it, I will cook it for you when you get back!"
There were really a lot of things bought now. Li Yu and Zhao Qian left the Dong'an market.
Although the market is still very dilapidated, within a few years, Dong'an Market will gradually develop from an open-air market with stalls to an all-encompassing market including shops, businesses, bookstores, and entertainment. supermarket.
When Li Yu got home, he went straight to the kitchen, "Fengling, crack some eggs for me. I want to show off my skills and make some dishes for everyone!"
Fengling was shocked and said: "How can the master of the house cook in person? Sir, please stop working. Just tell me what you want to eat and I will cook it."
Li Yu took out the tomatoes and asked, "Can you make this?"
Feng Ling said in surprise: "What is it? It looks scary."
Li Yu laughed: "I'm just saying, I'll do it!"
Although Li Yu's cooking skills are average, he can still make scrambled eggs with tomatoes, which is the most common home-cooked dish.
Not long after, a plate of red and yellow dishes was brought to the table.
Li Yu said proudly: "Try it!"
But Uncle Wang, Zhao Qian and Fengling didn't dare to eat. They looked straight at the plate and said, "Sir, please stop scaring us."
"Let me be the first person to eat tomatoes." Li Yu picked up the kuaizi and took a bite: "Yeah! Fortunately, sugar was added, it tastes great!"
The three of them saw that Li Yu was moving quickly, so they dared to taste it. Once they ate, they couldn't stop.
"Wow, sir, I didn't expect you to be a chef!"
"Yeah, he's still a watercress chef!"
"I didn't expect that our master is so versatile. I think this dish is worthy of the restaurant at the front door!"
Li Yu said with a smile: "This is not watercress, it is an authentic Chinese dish. If you go to any country, no one will make scrambled eggs with tomatoes for you, even if they have no shortage of tomatoes or eggs."
Fengling immediately said: "Sir, although I can't learn your Western knowledge, I must learn this dish!"
"Next time I cook it, keep an eye out! What's more, tomatoes can not only be used for cooking, but can also be eaten directly."
Li Yu then ate a raw tomato directly. After seeing it, several people followed suit. It was indeed sweet and delicious, and they praised it greatly.
As the first of the four common dishes in China, the first dish for everyone who learns to cook, scrambled eggs with tomatoes, which can be called the "national dish", actually only officially appeared around the 1940s, but Li Yu made it It was launched forty years in advance, which can be regarded as a moderate "initiative".
