The high-altitude test site was provided by Colonel Xie of the fire department. It was located at the fire training base, which has a training building with more than ten floors.

The high-altitude fall arrester developed by Dai Li is assembled at intervals of ten meters, that is, three floors are assembled as a unit.

The firefighters on the scene were cooperating with her to install fall protection.

Her high-altitude fall arrester is a very small box installed outside the wall, like a square lunch box.

"Teacher Xiao Dai, what is the fall prevention probability of your fall arrester?" Colonel Xie asked with his hands behind his back while watching the installation progress.

Up to now, Colonel Xie actually didn't know what Dai Li's high-altitude fall arrester looked like. Out of recognition of her ability and gratitude for her contribution to firefighting, when he received her call and learned that she wanted to conduct a high-altitude fall arrest test, Colonel Xie immediately helped her contact the venue without saying a word.

The reason why Dai Li asked the fire department for help was that the installation of a high-altitude fall arrester on site required a high-altitude work permit, and high-altitude rescue was originally under the jurisdiction of the fire department. They had training dummies, fire towers, and training buildings, which were very suitable for testing high-altitude fall arresters.

Dai Li first handed over her work, and then slowly explained to Colonel Xie.

"There are two types of objects falling from heights: large and heavy, which can pose a danger if they fall freely; and small and light, which are harmless. The fall prevention system detects the speed of the falling object and calculates its mass. If the impact force calculated by the formula is large enough to endanger people, the fall prevention system will activate. Otherwise, if the falling object is harmless, the system will not activate the fall prevention program."

Strictly speaking, the fall prevention rate is not 100%. What is 100% fall prevention is falling objects from high altitudes that can cause danger.

For example, bird feathers, fallen toilet paper, plastic bags, etc., these low-quality items will not trigger the anti-fall system.

Colonel Xie nodded thoughtfully in agreement: "It would be even better if it could screen for falling objects."

"But..." he asked again, "How exactly does your anti-fall system prevent you from falling?"

Dai Li: "Has Colonel Xie seen Spider-Man?"

This is hard for Colonel Xie, as he has never seen such a fashionable movie.

Dai Li: "Then wait and see the test results. You will know how to prevent falling after reading them."

The on-site installation took more than an hour, starting from the second floor. A fall arrester was installed every ten meters, and four were installed on each floor, one at each corner.

Wu Xuelin's voice came from the intercom, reporting that everything had been installed.

Dai Li replied: "Let's test it on a dummy first."

As soon as she finished speaking, two firefighters on the roof lifted up the dummy. The dummy was shaking on the roof, and then they let go at the same time, and the dummy fell down.

When the dummy fell to the tenth floor, the fall arrester installed on the eighth floor was activated.

The dummy's weight is that of a normal adult man, and the falling speed is very fast. The anti-fall system is activated almost in the blink of an eye.

A mesh thinner than a hair shot out from the small box, like a fishing net, tightly wrapping around the dummy and sticking it to the wall.

The firefighters watching the scene couldn't help but exclaim in amazement.

"Holy crap, that's cool."

"I didn't even see what happened. It just popped out."

Colonel Xie, who was standing downstairs, felt a greater visual impact. He opened his eyes wide in surprise and stared at the dummy on the wall on the eighth floor.

After the dummy was caught, the firefighters did not immediately go forward to pull the dummy in. The dummy leaned against the extremely fine mesh and remained motionless on the eighth floor.

After waiting for a long time, the firefighters finally arrived at the eighth floor and worked together to pull the dummy back in through the window.

Then the fall arrester retracted the net, and the appearance looked no different from before it was activated.

Colonel Xie came back to his senses and instantly understood what Dai Li had said about Spider-Man.

"It does look a bit like a spider web. Teacher Xiao Dai, is this the Spider-Man you were talking about?"

Dai Li nodded. "The design is just like a spider web, and the principle of catching falling objects is similar to that of a spider catching its prey."

"What material is your 'spider web' made of? Why can it stick to the outer wall? What is the maximum load-bearing capacity of such fine mesh? How do you retract it? How many times can it be reused?" Colonel Xie asked a long list of questions in one breath.

Dai Li: "The material of the wire mesh is an extremely nanomaterial. Even a nanobeam thinner than a hair is stronger than a steel wire. It can easily support a one-ton weight."

"As for why it can stick to the wall, it's because the wire mesh is hollow and filled with conductive liquid. The end of the wire mesh converts electrical energy into magnetic force, firmly adsorbing it to the wall. As long as the fall arrester is powered on, the wire mesh will never fall off."

"Also, the principle behind the retraction of the mesh is that the entire mesh is covered with sensing wires that can detect whether the object is still in the mesh. Once it determines that the object has been removed, the internal bearings will roll, thus retracting the mesh."

"As for the number of uses, as long as there is no external damage, the fall arrester can be used continuously."

Colonel Xie nodded as he listened, and praised her ingenuity repeatedly.

"I'm afraid only Teacher Xiao Dai could think of such a fall prevention method."

After saying that, he shook his head again: "No, not only can you think of it, but you are also the only one who can do it."

For example, for ultra-nano materials, conductive liquid is poured into the middle of the material and magnetic adsorption is used. If others were to do it, it would take at least ten to twenty years, and they might only be able to achieve one of them.

The firefighters on the training floor are conducting another round of tests.

This time they changed direction, carried the dummy to the other end, and threw it down in the same way.

As expected, the dummy was caught by the wire mesh of the fall arrester on the eighth floor again.

After more than ten experiments on the roof, there was not a single misjudgment of the anti-fall system, and it was activated accurately every time.

Then they went to the eighth floor, and this time the anti-fall system on the fifth floor was activated.

They also went to the second and third floors for testing. Even at such low floors, the fall arrester on the second floor could make a judgment in a very short time and activate the fall prevention system.

There were also eggs tied to the dummy, and all five eggs remained intact throughout the process.

Finally, we also tested relatively light items, such as bricks, flower pots, snacks, and paper towels...

Bricks and flower pots both triggered the anti-fall system, but snacks and paper towels did not react at all.

The fall prevention system was tested at the fire department's training base for a long time, and tests were carried out on different items and conditions almost every day.

The test results were not surprising at all. The fall prevention system was very stable. So far in the test, the dangerous goods have been activated 100%.

It was estimated that the time was almost up, so Dai Li called Colonel Xie and asked, "Colonel Xie, can the high-altitude fall arrester be actually loaded and used?"

"Of course." Colonel Xie replied without thinking.

"Teacher Xiao Dai, you don't know that your high-altitude fall prevention system is well-known in our fire department. During the period of base testing, many leaders took time out to come to the training base to watch the on-site testing. Everyone said that this thing is not good." Colonel Xie was full of emotion.

Both parties reached a unanimous agreement on the measured results of the high-altitude fall arrester.

The fire department also gave great support to the high-altitude fall arrester.

Just like the original constant temperature materials and flame-retardant mist, it improves the efficiency of firefighting and greatly reduces the danger of firefighting.

The same is true for high-altitude fall prevention systems.

Firefighting work also includes high-altitude rescue, and no one can predict what accidents may happen during high-altitude rescue.

There have been cases where firefighters were pulled down while rescuing people. There have also been cases where firefighters fell down because their safety ropes broke. There have also been cases where they were exhausted and could not wait for their teammates to rescue them.

This kind of news is not uncommon.

An accident will bring about an irreparable disaster.

The high-altitude fall arrester is the second line of defense, protecting not only the general residents but also the firefighters on the front line.

With the high-altitude fall arrester, people who are unable to think straight and have suicidal thoughts now have the opportunity to regret it.

After investigation, it was found that many of the survivors of jumping from buildings had already regretted it when they were falling.

But since they took that step, they have no chance to regret it.

Those who died on the spot were actually the luckiest. The very few survivors were mostly left with disabilities for the rest of their lives. Instead of finding relief, they caused themselves and their families to suffer more pain.

The emergence of high-altitude fall arresters can effectively avoid the above tragedies.

So before the new building code standards were introduced, the fire department signed a contract with Dai Li.

Dai Li's company first provided a batch of portable high-altitude fall arresters, which were temporarily installed on site when firefighters encountered high-altitude operations during their emergency response.

The only disadvantage is that it is rather troublesome as you have to wait for the fire department to arrive at the scene. If it is an accidental fall, the fire department will be out of reach.

Colonel Xie said regretfully, "Teacher Xiao Dai, your high-altitude fall arrester is really useful. It's a pity that I don't know when we can see it widely used."

Dai Li: "Take your time, there will always be real estate developers willing to pay for the equipment themselves."

Colonel Xie laughed and said, "They can even cut corners on mandatory construction standards, not to mention installing fall arresters at their own expense. There aren't many real estate developers with a conscience."

Dai Li laughed and said, "We have received a few orders and will be ready for installation in a few days."

Colonel Xie was surprised and asked, "Did they take the initiative to ask for it to be installed?"

Dai Li: "I know friends who are involved in the real estate industry. They are willing to install high-altitude fall arresters on the outside of their buildings at their own expense."

The few friends mentioned by Dai Li were naturally her partners.

For example, Guan Honghou has a large family and a large business, and has investments in both commercial buildings and office buildings.

Except for Haizhou, Song Jingshan and Yuan Heng, the three partners of e-ne all have families involved in the real estate industry.

Even Xiao Min himself has two buildings, which were left to him by his grandmother and mother.

This group of people all unconditionally supported Dai Li's high-altitude fall arrester and planned to order and install it without hesitation.

The actual installation attracted a lot of onlookers.

Not many people have paid attention to installing high-altitude fall arresters in office buildings. Passersby will not look up, and even if they see it, they will at most think that it is maintenance or cleaning of the glass.

Xiao Min owns an old building, which was left to him by his grandmother. It is located on an old street not far from the city center.

The old streets are more bustling, with many shops and residents. The average age of the nearby residents is relatively old. They cannot stay at home and like to stroll and chat on the streets when they have nothing to do. Everyone has been neighbors for decades. There is nothing new here. Even trivial matters can spread from one end of the street to the other.

So when the building started installing high-altitude fall arresters, it immediately attracted the attention of the residents.

Their ability to gather information should not be underestimated, and soon someone got the news.

On the street, they each grabbed a handful of melon seeds and ate them while watching the staff installing fall arresters at high altitude.

"What news have you heard? What are they here for?"

"I heard Aunt Liu say it seemed to be installed with some kind of fall protection device, saying that people could hold on to it after it was installed."

"Who are you hugging?"

"It was said that he was the one who accidentally fell from the building."

"Auntie Liu is talking nonsense again. How heavy is a person? Over 100 pounds. How can a small box hold a person?"

"I'm not saying anything bad about you, Mrs. Sun, but you also believe what Aunt Liu says. She loves to brag."

Aunt Liu came and was very unhappy when she heard what the neighbors said.

"What do you mean I just like to brag? I didn't say that myself. The installer told me that this is called a fall arrester. It's specifically designed to catch people who fall. It's the latest high-tech thing."

"This is the first time I've heard of a place specifically designed for hugging people? Why isn't it installed in other places, only in our building?"

Their street is quite long, about two or three kilometers, and there are many houses, but only theirs is being installed.

Some people read too much bad news and have bad thoughts in their minds.

"Isn't this a building they're using for experiments?"

"Oh, will there be radiation? My daughter-in-law is pregnant."

When they heard the word "radiation", everyone present panicked.

"I have to find someone to ask right away. We can't let anyone use us as experiments. My granddaughter is still young, and we old guys don't care. We can't harm the child."

They were extremely anxious and looked everywhere for the person in charge.

When Dai Li brought people to inspect the goods, they were stopped by the aunts who mistook them for staff members.

A group of people surrounded her.

"Girl, take down this anti-fall device you installed immediately."

"If you don't tear it down, we'll call the police right away."

Several buildings have been installed before, and everything went smoothly without any obstruction.

This time, from the anxious reactions of the aunts, Dai Li really thought something had happened and hurriedly asked, "What happened?"

"You're still asking us what happened. Don't you know what happened?"

Dai Li: "We are installing a high-altitude fall arrester. Did we disturb you during the installation process?"

"It's more than just disturbing, it's extremely disturbing. Tell them to tear it down immediately."

Wu Xuelin arrived a step late with the documents, and ended up seeing Dai Li falling for the aunts and grandmothers.

This group of aunts seemed to be good at fighting, and each of them looked like someone who could be easily provoked. It seemed that Dai Li was about to fall into a disadvantage.

He hurried over and stopped the aggressive aunts.

Wu Xuelin didn't know what had happened, but he felt it would be better for him to handle this matter. Even Dai Li would easily suffer if she met them.

"Boss, you go first, I'll take care of it."

When the aunties heard Wu Xuelin call Dai Li boss, it was even less likely that they would let her go.

"Girl, you can't leave. You have to help us deal with this." An old lady said as she was about to reach out to grab Dai Li.

Wu Xuelin moved sideways to block the aunt, squinting his eyes and smiling, saying, "Auntie, tell me if you have any troubles, and I will help you deal with it immediately. Don't worry, I will definitely not leave until I can handle it."

As a person who has been working for many years, he is very good at communicating with the elders. In addition, he has a good appearance, which makes him very charming to female elders. When he smiles, the other party will easily overflow with maternal love.

Seeing his sincere attitude, the aunt did not bother Dai Li and ordered Wu Xuelin bluntly: "I want you to remove the things installed on it. Can you do it now?"

Wu Xuelin's expression remained unchanged, and she continued to ask with a smile, "Auntie, can I ask why it's being demolished?"

Auntie: "Your thing is not safe. We are worried about installing it."

Wu Xuelin: "Auntie, if you have any specific concerns, you can tell us now. Look, our boss is here too, and we will definitely find a way to help you solve it."

"Our building is the only one on the entire street that's installing these devices. You're using us for experiments. The radiation from so many machines is just surrounding the residents of our building. We all have children at home. How can you let us feel at ease?"

"Yes, we feel relieved after it was demolished."

The aunties at the scene had the same request, which was to remove the high-altitude fall arrester.

Hearing the aunties' ridiculous reasons, Dai Li couldn't help laughing. She patted Wu Xuelin, asked him to get out of the way, and explained to them in person.

"The high-altitude fall arrester is to ensure the safety of your residents. As everyone has said, you all have children at home. Children have no sense of danger and are most likely to get into accidents. The fall arrester protects the safety of your children."

"Then why aren't other buildings installed? There are plenty of children in those buildings." The aunt was very persistent about this issue and hoped that there would be someone else to accompany her.

Dai Li smiled and said, "That's because only the owner of your building is willing to spend money to help you install the high-altitude fall arrester at his own expense, while the real estate developers and property management of other buildings are unwilling to spend this money. Our equipment production and installation costs money. Think about it carefully, would we really spend our own money to harm you?"

The aunts thought about it carefully and felt that what she said seemed to make some sense.

But some people still have questions: "What about radiation? Is your fall arrester really radiation-free?"

Dai Li: "Our equipment doesn't need to be plugged in, and the radiation isn't as high as the cell phones you carry around every day."

Now the aunties couldn't find anything to refute, but one of them still insisted on letting them leave their phone number.

"Please leave me your company's phone number. If I have any questions, I will contact you."

Dai Li asked Wu Xuelin to give the aunt a company business card.

The aunties then dispersed in large numbers.

Wu Xuelin sighed helplessly: "Even though we're clearly doing this for their own good, everyone still thinks we're bad people. It was the same thing when we went to the office building to install it a few days ago. Some people even said we were installing a bug."

Dai Li is more open-minded: "New technologies are like this. They always face difficulties. Now that they haven't become popular, of course some people will be worried. But once they become more popular, everyone will be willing to install fall arresters."

The installation of fall arresters for the entire building was completed within one day, and the acceptance work was also completed.

Although Dai Li and the installation staff have left, the topic of discussion among the residents of the old street is still about the fall arrester that was just installed today.

After dinner, the residents took a walk downstairs and chatted about the fall arrester outside the wall.

"How do you say this fall arrester prevents people from falling?"

"Want to try it yourself?"

"Fuck you, why don't you try?"

"If you can't try people, you can try things."

"You can't throw it around randomly. There are so many neighbors coming and going. What if it hits someone?"

"Why are you in such a hurry? We can't throw heavy things. We can throw something lighter."

"Okay, you live on the 17th floor, which is quite high up. Go ahead and try it."

A few people did it right away and took the elevator upstairs.

The rest of the residents waited downstairs, watching them conduct the experiment with their hands folded.

They still had some sense of public morality and knew not to throw anything too heavy down, so they chose a towel.

They leaned against the window, watching their towels falling down, waiting for the loaded fall arrester to activate.

As a result, the towel fell to the ground, and the anti-fall device on the wall did not move at all.

Several people were silent for a while.

"What's going on? Why is there no reaction at all?"

"Is it that their sensing device didn't react?"

"Do you want to try again?"

"Why bother trying? This is just a crappy anti-fall device. If I fall through it, I'll die a thousand times."

The man cursed, but still found another empty toothpaste can from home and threw it out through the windowsill.

The high-altitude fall arrester outside the window still had no response.

They found a bag of tissues and a pair of slippers from home...

They threw away nearly ten items in total, and finally the property management came to their door, so they stopped the experiment.

At the same time, they were also disappointed with the high-altitude fall arrester.

"What a piece of crap, it's useless."

The experimental results of that day spread almost throughout the entire street, and everyone knew that the fall arrester installed in their building was just a decoration and had no effect at all.

Every time the residents on this street pass by their building, they look up and point at their fall arresters.

"You know what? The landlord installed some kind of fall arrester to protect them from falling from heights."

"How could I not know? I was still there on the day of the installation."

"It's a waste of money to get something that's not even pretty."

The discussion about the fall arrester did not last long. The news on the old street was updated very quickly, and soon other news replaced the "decorative" fall arrester.

The high-altitude fall arrester came into public attention again in an accident half a month later.

That day, a four-year-old child woke up from a nap and went to look for his grandfather. He knew that his grandfather had gone out to buy groceries, so he stood on a stool and looked downstairs to see when his grandfather would come back. Then he lost his balance and accidentally fell onto the awning downstairs.

His family lives on the twelfth floor, and the child fell under the awning on the tenth floor. However, the residents on the tenth and eleventh floors were not at home, so there was no way to rescue the child from the best position.

The child’s grandfather had just returned from buying groceries. As soon as he returned downstairs, he saw a scene that terrified him.

The child's grandfather was so frightened that his hands suddenly became weak, the vegetables in his hands fell to the ground, and the eggs broke all over the floor.

He saw the child taking a nap and went out for a while. He didn't know that the child had an accident during this time.

The people downstairs became anxious.

"Is anyone home on the tenth and eleventh floors?"

"There's no one here. Everyone is at work right now."

"Did anyone call the police?"

"Yes, I called a long time ago. He should be here soon."

No matter how fast the police are, it will take some time for them to arrive.

But apparently the kid on the roof couldn't wait any longer.

The roof of the balcony awning on the tenth floor was covered with moss, and it had rained in the morning, so the surface was very slippery.

The child sitting on it kept sliding down, and he kept climbing up. He was so scared that he kept crying and calling for grandpa, dad and mom.

But no one could save him.

He slipped and fell from the edge of the awning in front of everyone's eyes.