This phone call is about the news that the Taibai Cat Mars landing car is about to be launched. It will take about half a year to go. It will take about January next year to fly in space for several years before reaching the surface of Mars.

Think about it...

This is so far away!

After Xu Mang hung up the phone, he silently collapsed on the sofa and looked at the current stock market. At present, it was a big drop. However, Xiaoman, a woman, broke her promise and withdrew after saying 20,000 points. As a result, she still stayed in the stock market and couldn't come out.

At present, the United States has made preparations to rescue the market and should usher in a big upward trend. However, Xiaoman disagreed. This is just an expectation. It will soon dive. Not to mention... Xiaoman is indeed awesome!

The three major U.S. stock indexes opened higher across the board, then fluctuated downward, and plunged in the late trading.

This girl snatched a lot of money from others. Although she didn't know how much she made, she made a lot of money from her momentum, which was too much to estimate. Of course, this amount of money is still a bit too small for some financial families.

After all, in this world turmoil, not only Xiaoman is making money alone, but many people are craving leeks together.

"Hello?"

"roll!"

Bang!

Xu Mang hung up the phone directly and wanted to watch the performance. The performance was so big... Xu Mang was very angry at this moment. Xu Si Shi was out of the title of Xu... It seems that something needs to be done to offset the negative effects caused by suicide by swallowing feces.

do what?

This...I don't know!

But I was too lazy to move and waited until the child was born... Now this stage is the most unstable stage for Xiaoman to be with her, so try to stay by her side.

After thinking for a while, Xu Mang put on and took the car keys and went to the nearest square. Since he was a prospective father, he must take the responsibility of his father and buy some toys for his children, such as toys that are comprehensively developed in morality, intelligence, physical fitness, aesthetics and labor.

"Chen Xi?"

"Do you have time?"

"Why go to the mall with me? Buy some toys for your nephew and nieces, um... bring Xiaoqiong with you too." Xu Mang sat in the driver's seat, touched his wallet, and said seriously: "By the way...you two are here."

...

moment,

Xu Mang waited for Chen Xi and his wife in the cafe. Xu Mang was quite happy when he saw the two of them who were exhausted, which shows that Xu Yang and Xu Man have a high status in Chen Xi and Xiao Qiong's minds, but... this is also related to his own and Xiao Man.

"elder brother?"

"Why did you suddenly ask to buy toys for your child?" Chen Xi sat opposite Xu Mang and asked curiously: "I can't understand a little...what is the situation?"

“Be ready in advance.”

"When will you two have a child?" Xu Mang took a sip of coffee and asked curiously: "It's almost done... By the way... you need to discuss something. Remember to pay for me, don't forget."

“…”

“…”

Sure enough,

There is no benefit to find yourself, it turns out that you didn’t bring any money.

"elder brother?"

"Miss Xiaoman has made so much money, why... why didn't she give it to you?" Xiao Qiong asked confusedly: "I asked my dad, he said that this time the stock market crash in the United States suffered heavy losses, and those short sellers have gained a lot of benefits."

"Although I made a lot of money, I didn't take it out, and I'm still in it... My sister Xiaoman doesn't know what the situation is, and I plan to make a little more money." Xu Mang shrugged and said calmly: "I'm enough to buy vegetables now, and my life is quite difficult..."

Buy groceries?

I'm afraid your grocery shopping is about tens of millions, right?

Chen Xi didn't believe Xu Mang's nonsense. He was deceived by him in high school before, but let's forget it this time. After all, buy toys for his future nephew and niece. Besides... how expensive can toys be?

However...

I never expected that things were not that simple.

The Lego Building Blocks Store in Magic City is also the largest Lego store in the country. Xu Mang is talking to the store manager about buying ten sets of Lego building blocks. Unexpectedly, this store manager from abroad admires Xu Mang very much and agrees to his request.

"What?"

"A full set of building blocks in Star Wars?"

Chen Xi knew the pit of Lego building blocks, and also knew that the most valuable thing in it was about Star Wars building blocks. I heard that there was a set worth more than 40,000 yuan. Good guy... Brother Xu Mang actually bought the full set. Who did you buy toys for?

"elder brother?"

"Are you buying toys for yourself?" Chen Xi frowned and said carefully: "Actually, I don't care. At most, it costs hundreds of thousands. How do you explain to Miss Xiaoman? Are you not afraid of being beaten to death by her?"

"cut!"

"I'm already invincible for all poisons." Xu Mang shrugged and said calmly: "Pay now!"

Swipe the card,

Then he gave an address, and the store would send a special person to deliver the toys to the house, and then the three of them went to have a meal, a pretty high-end barbecue restaurant.

"Brother Xu Mang?"

"Do you know the n-Queen problem in chess?" Xiao Qiong asked curiously.

"have no idea."

"Why did you ask this suddenly?" Xu Mang was eating barbecue and said with a blank look: "What is the problem with this n-Queen?"

"that is..."

"Put eight queens on eight chess boards so that they cannot attack each other, that is, no two queens can be in the same row, in the same column or on the same diagonal line, how many ways are there to put them?" Xiao Qiong said: "If you are on the chess board of twenty-five chess, there will be more than two billion possibilities."

"oh..."

"So that's how it is..." Xu Mang suddenly realized, thought carefully, and said seriously: "If I don't understand it wrongly, in the classic mathematical algorithm... can't solve the problem of the twenty-one queens?"

Hearing Xu Mang's words,

Xiao Qiong showed a terrified expression and said in surprise: "You... do you know?"

"have no idea."

"I can calculate it." Xu Mang smiled: "I won't tell you how I calculated it, you won't understand anyway."

Xiao Qiong put away her surprise and felt that she was still too young. After all, she was doing something in front of her, and she knew everything and could do everything... Anything that was incredible was taken for granted in front of him.

"Our school has been studying the n-Queen problem recently." Xiao Qiong said: "Actually, I also heard that a professor in the Department of Physics believes that quantum physics can solve the mystery of the queen."

Xu Mang was stunned for a moment, and soon he understood the principle of why he did this. This may be because it used the interaction between atoms to make atoms become chess queens. They acted according to chess rules, that is, they avoided each other in all directions of the chess board.

good!

This method is interesting!

Xu Mang pondered for a moment and said seriously: "Did you bring paper and pen?"

"Take it!"

"Give it to me..." Xu Mang said.

"oh."

moment,

Xiaoqiong took out a note book and a black pen from the bag, as the two things she had to work part-time in Xiaoman's company, and she was ready for the bag at any time.

After getting the paper and pen, Xu Mang wrote some very complex formulas on it, and these formulas are all about quantum mechanics to solve the mystery of the queen. In this method... one problem needs to be considered first. The repulsive force of particles requires a device to be applied along the direction of motion to be generated.

What is this device?

Second...

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

"Give!"

"Sometimes, I hand over what I wrote on it to the physics professor at your school." Xu Mang said with a smile: "This is some small advice I gave him."

"ah?"

Xiaoqiong took the notepad handed over by Xu Mang with a panic look on his face. Although he didn't know what was written on it, there were a large number of mathematical formulas and several scattered paragraphs of text that were difficult to read, this was Academician Xu Mang's suggestion, and you can imagine how precious it is.

"elder brother?"

"Can I copy one and give it to someone else?" Xiao Qiong said with a smile: "Your original manuscript... is so precious! Einstein's manuscript was once excluded from a sky-high price. I think in fifty years... my manuscript will be sold for a lot of money."

“…”

"No need." Xu Mang said with a wry smile.

After dinner,

Xu Mang went home and secretly placed the toys he bought in the basement warehouse.

At 4:30 pm,

I drove to Xiaoman's company and brought some delicious meals by the way.

"Is it tasty?"
To be continued...