This call is about the news that the Taibai Cat Mars landing rover is about to go to space, and there is still about half a year, probably in January next year, the Taibai Cat Mars rover will go to the sky, and it will need to fly in space for several years before reaching the surface of Mars.

Think about it...

It's so far away!

After Xu Mang hung up the phone, he silently collapsed on the sofa and glanced at the current stock market, which has fallen sharply at present, but Xiaoman, a woman, broke her original promise and said that she would withdraw at 20,000 points, and as a result... It's still stuck in the stock market.

At present, the United States has made preparations to rescue the market, and it should usher in a sharp upward trend, but Xiao Man disagreed, this is just an expectation, and the phenomenon of diving will happen soon, not to mention... Xiao Man is indeed awesome!

The three major U.S. stock indexes opened higher across the board, and then fluctuated downward, diving at the end of the session.

This girl has shaved a lot of money from others, although I don't know how much she earned, but judging from the momentum of her words, she has earned a lot, so much that it is impossible to estimate, of course, this money is still a little bit insufficient in front of some financial families.

After all, in this world turmoil, it is not just Xiao Man who is making money alone, but many people are frantically cutting leeks together.

"Hello?"

"Get out!"

Syllable!

Xu Mang hung up the phone directly, he actually wanted to watch the performance, the performance was big... At this moment, Xu Mang was very angry, and Xu Si went out with the title like this... It seems that something needs to be done to counteract the negative effects of suicide by swallowing feces.

Do what?

This one... I don't know!

But I didn't bother to move, and slowly waited until the child was born... Now this stage is the most emotionally unstable stage for Xiao Man, try to be by her side as much as possible.

After thinking about it for a while, Xu Mang put on and took the car keys, and went to the nearest square, since he is a father-to-be, he must take on the responsibility of a father and buy a little toys for the child, some toys for the all-round development of morality, intelligence, physical fitness, art and labor.

"Tatsuki?"

"Do you have time?"

"Why don't you come with me to the mall? buy some toys for your nephew and niece, um... Bring Joan with you. Xu Mang sat in the driver's seat, touched his wallet, and said seriously: "That's right... Just the two of you. ”

...

moment

Xu Mang waited for Chen Xi's little couple in the café, and when he saw the two of them, Xu Mang was still very happy in his heart, indicating that Xu Yang and Xu Man still had a very high status in the minds of Chen Xi and Xiao Qiong, but... This is also related to himself and Xiaoman.

"Brother?"

"Why did you suddenly propose to buy toys for your child?" Chen Xi sat opposite Xu Mang, and asked curiously, "I don't understand a little... What the hell is going on?"

"Be prepared in advance. ”

"When are you two going to have a baby?" Xu Mang took a sip of coffee and asked curiously, "It's almost enough... That's right... There are some things that you need to discuss, remember to help me pay for them, don't forget. ”

“...”

“...”

Sure enough,

There is no benefit in looking for yourself, it turns out that you don't bring any money.

"Brother?"

"Sister Xiaoman has made so much money, how... Why didn't you give it to you?" Xiao Qiong asked confusedly: "I asked my father, and he said that this time the stock market crash in the United States suffered a lot of losses, and those short sellers got a lot of benefits. ”

"Although I made a lot of money, I didn't take it out, and I still had it in it... Your little sister doesn't know what the situation is, and she plans to make a little more. Xu Mang shrugged his shoulders and said indifferently: "I have enough money to buy vegetables now, and my life is quite tight..."

Grocery shopping?

You're probably buying tens of millions of groceries, right?

Chen Xi doesn't believe Xu Mang's nonsense, he used to be deceived by him when he was in high school, but forget it this time, after all, buy toys for his future nephews and nieces, besides... How expensive can toys be?

However...

I never thought that things were not so simple.

The main store of Lego bricks in Modu, which is also the largest Lego store in the country, Xu Mang was talking to the store manager about buying ten sets of Lego bricks, and he didn't expect that the store manager from abroad admired Xu Mang very much and agreed to his request.

"What?"

"A full set of Star Wars bricks?"

Tatsuki knows the pit of Lego bricks, and he also knows that the most valuable thing in it is about Star Wars bricks, I heard that there is a set worth more than 40,000 yuan, good guy... Brother Xu Mang actually bought a full set, who is this to buy toys for?

"Brother?"

"Are you buying toys for yourself?" Chen Xi frowned and said cautiously: "Actually, I don't care, at most it will cost hundreds of thousands, how can you explain to Sister Xiaoman?" Aren't you afraid of being beaten to death by her?"

"Cut!"

"I'm not poisonous. Xu Mang shrugged his shoulders and said indifferently: "Hurry up and pay!"

Credit card

Then an address was given, and the store would send someone to deliver the toys to the house, and then the three of them went to eat, a fairly high-end barbecue restaurant.

"Brother Xu?"

"Do you know the N queen problem in chess?" asked Joan curiously.

"I don't know. ”

"Why are you asking this all of a sudden?" Xu Mang was eating barbecue and said with a blank face: "What is this Queen N question?"

"It's just..."

"Put eight queens on an eight-by-eight chess game so that they cannot attack each other, i.e., no two queens can be in the same row, in the same column, or on the same diagonal line, and there are as many ways as they can play. Xiao Qiong said: "If you are on a chessboard of twenty-five by twenty-five, there are more than two billion possibilities. ”

"Oh..."

"So that's the case..."Xu Mang suddenly realized, thought about it carefully, and said seriously: "If I don't understand it wrong, in the classical mathematical algorithm... Isn't it impossible to solve the problem of twenty-one queens?"

Hearing Xu Mang's words,

Xiao Qiong showed a frightened expression and said in surprise: "You... You know?"

"I don't know. ”

"I can figure it out. Xu Mang smiled: "I won't tell you how to calculate it, you don't understand it anyway." ”

Xiao Qiong put away her surprise, feeling that she was still too young, after all, she was a world-class physical scientist in front of her, omniscient, omnipotent... Anything that feels unbelievable is taken for granted in front of him.

"Our school has been working on the N Queen issue lately. Xiao Qiong said: "Actually, I am also hearsay, a professor in the physics department thinks that quantum physics can solve the mystery of the queen. ”

Xu was stunned for a moment, and soon he understood the principle of why he did this, which may be using the interaction between atoms to make atoms become chess queens, and they act according to the rules of chess, that is, dodge each other in all directions of the chessboard.

Not bad!

It's interesting!

Xu Mang pondered for a moment and said seriously, "Did you bring paper and pens?"

"Bring it!"

"Give it to me," Xu said.

"Oh. ”

moment

Xiao Qiong took out a notepad and a black pen from her bag, as a part-time job in Xiaoman's company, these two things are ready in the bag at any time.

After getting the pen and paper, Xu Mang wrote some very complex formulas on it, and these formulas are all about the root of quantum mechanics to solve the mystery of the queen, in this method... First of all, we need to consider the problem that this repulsive force of the particle needs a device applied in the direction of motion to be generated.

What is this device?

Second...

Because there are so many possibilities, it will take a very long time, so it is crucial how the atoms cool down very quickly and make their quantum properties work.

"Give!"

"Sometimes I give what I've written to the physics professor at your school. Xu Mang said with a smile: "Here are some small suggestions for him." ”

"Huh?"

Xiao Qiong took the notebook handed over by Xu Mang with a panicked face, although she didn't know what was written on it, densely packed with a large number of mathematical formulas, and a few paragraphs of text that were very difficult to read, but this was Academician Xu Mang's suggestion, it can be imagined... How precious.

"Brother?"

"Can I make a copy and give it to someone else?" said with a smile, "Your original manuscript... Einstein's manuscript was excluded from a sky-high price, and I think fifty years from now... My manuscript will also sell for a lot of money. ”

“...”

"There's no need. Xu Mang smiled bitterly.

After eating,

Xu Mang went home, and then secretly put the toys he bought in the warehouse in the basement.

At half past four in the afternoon,

Drove to Xiao Man's company and brought some delicious meals by the way.

"Is it delicious?"

"If it's delicious, you eat more. Xu Mang sat next to Xiao Man and said with a smile: "I've been busy for a lot of time. ”

“...”

"Did you go shopping for toys in the morning?" Yang Xiaoman glanced at Xu Mang and asked indifferently.

"Huh?"

"How do you know?" Xu Mang was stunned for a moment, and said in a low voice: "Buy... Bought a little for the kids to play with. ”

"Humph!"

"Xiaoqiong posted a circle of friends, saying that she would buy toys for her niece and nephew, are you and Chen Xi in the front two backs?"

"You still have a conscience and know how to prepare in advance and go home today... No longer in the company. Yang Xiaoman said softly: "By the way, let's see what toys you bought for the child." ”

Xu Mang:( ̄△ ̄;)

Finished!

It's all over!

Back home,

Accompanied by Xu Mang, Yang Xiaoman came to the basement of his home, but when he saw the box in front of him, it exploded instantly.

( ̄ ε(# ̄)☆╰╮o( ̄dish ̄///)Kill you!

...

Jiaotong University,

Xiao Qiong contacted a certain senior sister, she is a graduate student in the Department of Physics, and she happens to be in the team of a certain professor.

"Joan?"

"Why did you suddenly think of me?" This senior sister has a good relationship with Xiaoqiong, the two are members of a club, and they usually communicate.

"Hee-hee~"

"Of course I miss you. Xiao Qiong said: "By the way, senior sister... Someone asked me to bring a letter of advice to the professor on your team, can you pass it on to him for me?"

......