In the Overworld, in a rented suite rented by Li Hao.

A little blue light lit up in mid-air, and the blue light gradually expanded to form a circle, and the space at the edge of the aperture was slightly distorted, rippling like water waves.

The center of the aperture gradually becomes transparent, and a robot with a metal shell can be seen standing inside the aperture. It turned its head and said, "Master, I'm just going to walk over like this?" I won't be scrapped and recycled. ”

"Coward, get inside. Oh, wait a minute, bring that brain and converter with you, maybe you'll be able to use it. ”

Iron Sheet picked up the brain in one hand and carried a small half bag of cordyceps in the other, passing through the aperture. Li Hao followed it and returned to the main world.

Iron Sheet looked around, looked at the furnishings in the suite, and said, "Master, the technological level of this planet is much higher than the one just now, and there are a lot of radio waves in the air. Hey, master, I found that this planet is highly similar to the one just now, the gravitational level and rotation speed of the two planets are exactly the same, and the calculation to a dozen decimal places is exactly the same. ”

Li Hao said angrily: "You are full, why are you calculating the gravitational force and rotation of the planet, is it too much energy?" Just switch back to the 'extremely energy-efficient' mode. ”

"Don't, don't, I'm not just in a new environment, and I want to get acquainted with it?"

Li Hao turned on the computer in the suite and said, "I want to watch the news on the Internet, you squat in the corner of the wall and draw circles." Remember, you can't let the people of this planet know about your existence, it's an order, you know? ”

"Yes, master." Iron Sheet came behind Li Hao to watch him surf the Internet, and automatically filtered the sentence of squatting in the corner of the wall to draw circles. I don't know how it decided that it was a joke and not an order.

Although Iron Sheet sometimes talks a lot of nonsense, he never makes the slightest mistake in what he is told to do, and is generally a very trustworthy guy.

Li Hao browsed the news during his trip to the Northern Song Dynasty, charged his mobile phone at the same time, turned on his mobile phone, and received a lot of text messages as soon as he turned it on. Li Hao listened to the voice message first:

"Brother, you are so good, you can publish a paper in "Mathematical Research", and prove the 'four-color theorem' in a concise way, and many newspapers have reported your deeds, I will send these newspapers back to my parents, so that they can also be happy."

"Li Hao, I'm Pan Bin, I didn't expect you to be in retreat for a month, and you actually solved a math problem with a world surname. Those reporters couldn't find you, so they came to interview a few of us, and we were interviewed by several groups of reporters. We really envy you, you must have a treat this time. ”

"Hello, Li Hao, I am a reporter from Huaxia Science and Technology magazine, I want to do an interview with you, I don't know when you are free?"

"Hello, Mr. Li Hao, I am Kevin from the Massachusetts Institute of Technology, I still have some questions I want to discuss with you about the particle hypothetical model last time, and my latest ideas have been sent to your mailbox, looking forward to replying."

"Li Hao, I am Liu Yuanshan from the Department of Mathematics, congratulations on using traditional mathematical methods to prove the 'four-color theorem'. I wonder if you are interested in transferring to the Department of Mathematics to study for a master's degree? We'll talk about it when you get back to school. ”

Li Hao searched for his name on the Internet, and many news headlines came out at once, such as: "Huaxia Institute of Technology Students Solve World Mathematical Problems", "The Century-long "Four-color Problem" Has Been Drawn to the Most Perfect End", "A New Star in the Mathematics World", "Academician Qian of the Academy of Sciences Praises Li Hao"

Although there are many reports, they are not too in-depth, and most of them are just reprinted, after all, the general media do not know much about the professional field of mathematics.

At this time, the mobile phone rang suddenly, Li Hao took a look, it was Han Zhi calling, and the eavesdropping equipment he brought to the Northern Song Dynasty last time was borrowed from him. Li Hao answered the phone: "Han Shao! ”

Han Zhiqing's laughter came from the phone, "Ah Hao, congratulations, you have overcome the world's problems, many media have reported your deeds." ”

"Those reporters like to exaggerate, in fact, there is nothing remarkable, the four-color theorem has already been proven, I just changed the proof method."

"Don't be humble in front of buddies. Grandpa scolded me yesterday, saying that none of the fox friends I made were promising. I picked up the newspaper he was reading, pointed to the headline on it and said, 'At least one, this Li Hao, who is also my friend, is there any interest?' Grandpa was dumbfounded by my rebuttal, haha, it was so painful. It's been many years, and I haven't seen anyone who can refute grandpa to the point that he has nothing to say, it's really not easy. ”

Li Hao was surprised: "You really dare to contradict it, aren't you afraid that General Han will be angry and ask the guards to pull you to Haibian?" ”

"No, although grandpa is sometimes temperamental, he will never be unreasonable. By the way, if you don't leave these days, I'll go to you the day after tomorrow and celebrate together.

Li Hao would spend a period of time in the main world, buying equipment to build an arsenal in the Northern Song Dynasty, and at the same time preparing related technologies. When Han Zhi came over the day after tomorrow, he definitely hadn't gone to the Northern Song Dynasty yet. "Okay, I'll be here for the past few days."

"Then it's decided, see you the day after tomorrow!"

After hanging up the phone, Li Hao looked at the text messages he received again, and the last few were all sent by his sister Li Ying:

"Brother, why did you turn off your phone? Our company's server was hacked, and we received a text message and called back quickly. "The company's hardware firewall has recorded a lot of unusual incidents, and the technician said that hackers tried to infiltrate, but they didn't succeed. What am I going to do? Should you hire a cybersecurity consultant? "I'm dying, brother, you reply to my phone quickly."

Hackers are being targeted so soon? But Li Hao is not worried, even if the hacker can successfully invade and even obtain administrator permissions, he will not be able to discover the secret of artificial intelligence. Because the "education expert" is not installed on the company's server, but in his own room.

Twice a week, the Education Expert host is automatically connected to the company's server to analyze the student's data and update the teaching plan. This process only takes a few minutes at a time. When this is done, it automatically shuts down, and the power supply for external timed power is also disconnected.

Although the secrets of artificial intelligence will not be revealed, Li Hao will never tolerate hackers invading the company's servers. There are users' personal information, detailed and complete teaching plans, and company trade secrets, which must never fall into the hands of hackers.

Li Hao dialed a phone call to Li Ying, the phone was immediately connected, and Li Ying's anxious voice immediately came out: "Brother, you haven't turned on your mobile phone for many days, and you're in a hurry." ”

"I don't like to be disturbed by phone calls when I'm researching, so I don't usually bring my phone with me."

Li Ying said angrily: "How can it be like this? If you are afraid of being disturbed, you can buy an extra mobile phone, and only tell me the number. Otherwise, the company will not be able to contact you if it is urgent. ”

"This ...... No, last time I suddenly had the inspiration to solve a big problem in mathematics, but I was interrupted by my mobile phone, and I couldn't remember it anymore, I was in pain for a month, and I will never bring my mobile phone when I do research in the future. How's it going? The hackers didn't succeed. ”

"Not yet, but they're all attacking these nights. I just contacted a company that does cybersecurity services and asked them to take a look. ”

Li Hao frowned and said, "It's not good, people outside can't believe it, this may lead the wolf into the room." ”

"It was a big, well-known company."

"I can't believe it, even if their company is fine, there is no guarantee that their technicians are not selfish. You must have this sense of worry, technology is the core asset of our company, is the life of the company, and there must be no leakage. Including our company's own recruitment of technicians, we must be cautious. ”

Li Ying was slightly surprised, fortunately, the experts of that company had not yet come, she immediately asked her subordinates to inform the company that there was no need to send someone here, and then she asked, "Then what now?" Listen to our technicians, there is more than one hacker. ”

"Don't worry, I'll get it done this time. I'll also hire a few real experts to take care of the company's servers. By the way, how many users does the company have now? Can you afford to pay a master's salary? ”

When it came to the company's situation, Li Ying became excited and gushed about the company's recent development momentum.

Now the number of downloads of the software is incalculable, because the client has been submitted to major download sites, many of which can be downloaded for free.

As of yesterday, the number of registrations has exceeded 89,000, and this number is still growing significantly every day. Recently, more than 52,000 active users have been online every day.

As for the paying users, it has reached 3,627, and you must know that there is still a day before the end of the first batch of free trials, and so many people have paid in advance. There were more than 300 people who paid yesterday alone, and the income yesterday exceeded 40,000 yuan.

According to yesterday's income, the company's monthly income has exceeded one million, and now the company has less than 10 employees, including the part-time workers and aunts who are engaged in hygiene.

Not long after the launch of "Tutor", Li Ying only advertised once in the newspaper for primary and secondary school students, and also advertised in the education channel of a portal website for two weeks, which shows the popularity of this software.