Everyone knew in their hearts that since Sun Yuanqi mentioned how bats caught insects, the principle of discovering the plane must be roughly the same. But everyone is accustomed to bats flying at night. As for how they caught food, no one has thought about it carefully.

Qian Nengxun was obviously very interested in this and asked uncertainly: "Sir Sun, bats can catch insects at night. Is it as extraordinary night vision as cats, dogs, mice and foxes?"

Sun Yuanqi shook his head slightly: "At the end of the 18th century, the famous Italian biologist Spalanzani was very curious about bats flying freely in the dark, so he captured several bats, blinded their eyes, and placed them in a room full of obstacles. As a result, they were able to avoid obstacles and fly freely. A few days later, he captured these blind bats again and dissected them, and found that their stomachs were filled with insect remains. What does this experiment mean? It shows that bats' flight and predation do not rely on vision.

"Then, Spalanzani tested other senses of bats with his usual serious attitude, and finally found that as long as the bat's ears were blocked, the bat would be powerless. He flew in the room and would occasionally hit obstacles. Why is this so? Can animals see things with their ears? Unfortunately, Spalanzani did not explain this, and this strange experiment ended abruptly."

Everyone's curiosity was sluggishly hung to their throats. Unexpectedly, Sun Yuanqi gave such an ambiguous answer, which made everyone feel that they couldn't go up; they couldn't go down, and they couldn't help but look at each other.

After a while, Sun Yuanqi continued: "It was not until recently that relevant scientific discoveries showed that there was a structure called "nose-shaped leaf" on the bat's mouth and nose, and there were very complex special skin wrinkles around it. This unique device has the function of emitting ultrasound and can continuously emit high-frequency ultrasound waves of 40,000 to 300,000 Hz; and each bat has its own specific frequency and can identify the sound waves it emits with its ears. In this way, large groups of bats fly together at night without worrying about interfering with each other.

"How do bats use ultrasound to discover and identify obstacles? After the ultrasound is emitted, if they encounter obstacles or flying insects, those ultrasounds will be reflected back and received by the bat's extraordinary large auricle.

The feedback information will be quickly analyzed in their brains, and based on the size, time and direction of the ultrasound reflected back, it can locate the flight route and identify different insects or obstacles, and effectively avoid or hunt them. In short, it is to use echo to determine.

"In fact, we also use echo positioning in our daily lives. For example, when we can't see the road ahead clearly when we can't see the road ahead clearly, we are used to throwing a small stone forward, and roughly identifying the basic road conditions ahead according to the sound of the stone falling to the ground; we can also shout a few times and determine whether there are huge cliffs in front based on the echo. Similarly, we can also use this method to identify aircraft coming from the sky, and we can also find submarines lurking under the water, and even fetuses in pregnant women's belly."

In real history, the first person to invent the method of using ultrasonic echo positioning should be the handsome guy Lang Zhiwan who has an ambiguous relationship with Madame Curie. During World War I, in order to deal with the German submarine lurking on the seabed, he thought of using sound waves to detect the submarine and determine its position with its echo. By the time the device could operate, the battle was over.

Radars that use radio methods to discover targets and measure spatial positions appeared during World War II. At that time, Britain and Germany were fighting. Britain, which was suffering from German air strikes, urgently needed a radio detection and range measurement technology that could detect metal objects in the air so that it could be the first to discover German aircraft in anti-aircraft attacks, so radar came into being. Of course, before the emergence of radar, many people had proposed the concept of measuring long-distance objects using echo positioning methods, including Lang Zhiwan, the father of radio, Marconi, and some other scientific researchers. Radar was just one of the more successful and widespread applications.

The linking ultrasonic echo positioning with bats started from Hart in 1920. However, Hart's prompt did not attract the attention of people at that time, because scientists could not imagine that low-level creatures such as bats actually possessed such advanced technology as "echo positioning". It was not until 1983 that Hart's view was finally confirmed.

Therefore, in the objective history of science, the invention of radar has nothing to do with bats. It was only after the fact that the principles of the two were the same. The so-called "the principles of radar and sonar are both inspired by bats" and "bats are the prototype of radar and radars are the expansion of bats" can only be regarded as a beautiful imagination, or a trick of bionicists to make self-giving.

Qian Nengxun couldn't help but praise: "Bats fly at night, which is common to people. Who can think that there is such a profound truth? Even if someone can understand the truth, who can think that they can use it to detect the planes coming from the sky? You can see the small things so well, and see the big ones in the small. Lord Sun is indeed a saint today, and he is famous! Qian admires it!"

Sun Yuanqi politely said that Brother Qian was accused of being accused of being accused of being accused of being accused of being accused of the ancient sages.”

"Oh? Which wise man is it?" Qian Nengxun was a little surprised: Although he was not a well-read book, he read a lot of miscellaneous books from Zibu before the Ming and Qing Dynasties. It seems that no book talks about the principle of bats flying at night, otherwise he should have an impression.

"It's Lu Ban!" Sun Yuanqi replied firmly, "It is rumored that he invented an iron saw based on the edge of silk thatch. He cut bamboo and wood into magpies, and flew them all for three days. These are imitations of the special skills of animals and plants in nature and promoted them, and eventually became a good tool for us humans. This kind of knowledge can be called "bionics," and Lu Ban is undoubtedly the originator of this science.

"The so-called bionics, simply put, are a science that imitates the special skills of biological organisms. For example, imitating fish using the principle of ups and downs of fish bladders, and using the principle of hooking clothes to create new buckles. As for making saws, aircraft and radars that detect objects, they are just very simple applications of bionics. In time, bionics will surely achieve even more significant results."

Take a few short stories from the classics and find a wonderful method and interpret it into a profound knowledge. How can this skill be possessed by ordinary people? Everyone couldn't help but admire it even more.

Li Fuji replied at this time: "Mr. Sun, our research institute will quickly draw some young backbones to establish a research institute to specialize in developing weapons and equipment for counter-air aircraft. For the bionics you mentioned, it provides a new idea for solving specific problems, and we will also learn from it in the actual scientific research process."

Sun Yuanqi walked around the northwest and soon returned to Beijing, waiting for the echo from Outer Mongolia.

Unexpectedly, the first response to Sun Yuanqi’s “Medon Book” (ultimatum) was not the so-called “Mongol Empire Emperor” Tepundanba, nor the pseudo-Foreign Minister Handadorji, but the Tsarist Russian Consulate in Dihua. Their attitude was as arrogant as ever, and claimed in the note: “According to the six conditions for Sino-Russia negotiations proposed by Russian Minister Kubensky on December 14 last year, Mongolia is a sovereign state before the two countries signed a treaty, sovereign states have the right to station troops on their own borders to resist foreign aggression, and no one is allowed to interfere.”

Regarding the notes sent by the Tsarist Russian Consulate, Sun Yuanqi directly chose to give them a message without comment. In his opinion, Outer Mongolia is an internal affairs and does not require foreign forces to intervene, and foreign forces have no right to intervene. If Outer Mongolia really has any reason or explanation, please send a telegram directly to Djobzundanba or Hangdadorji!

There is no doubt that Tsarist Russia and Outer Mongolia regarded Sun Yuanqi's silence as cowardice. Under their illumination or insidious instructions, Danbaijiangcun actually led his troops to move forward fifty miles towards Xinjiang again.

Sun Yuanqi is gentle and elegant in daily life, with gentle breeze and drizzle. He also tries to be kind to others when interacting with others. Not to mention bigwigs like Sun Yat-sen and Yuan Shikai, even Song Jiaoren, Cai Yuanpei, Zhang Jian, Yan Xishan and others are not psychologically stressed. But this does not mean that he is just a soft persimmon and can be pinched by anyone. As the saying goes, "The dragon has reverse scales, and those who touch it will die." As long as it touches Sun Yuanqi's bottom line, it will arouse his strongest revenge.

The first bottom line is the Jingshi University, which is devoted to his countless efforts. Therefore, when the Imperial Guards besieged Jingshi University under the command of Han Shimada, Zaitao and others, Sun Yuanqi was furious and even dared to use planes to threaten and bomb the Forbidden City. This move indirectly led to the rebellion of the Imperial Guards and the Qing Dynasty abdication.

The second bottom line is the national territorial integrity. Although limited by his own strength and personal temperament, Sun Yuanqi could not personally lead a million troops to eliminate civil thieves and defend against national insults, but within his ability, he still paid great attention to maintaining national territorial integrity. Therefore, he once criticized Sun Yat-sen for treason for treason, and could make concessions to Yuan Shikai and others due to national territorial issues, and sent troops to expedition to Tibet when his own troops were insufficient.

Sun Yuanqi had long been resentful of the rebellion of Outer Mongolia and the aggressiveness of Tsarist Russia, but his strength was disparity, and the parliamentary election was imminent, so he endured it until now. In the original plan, he was planning to drag the Outer Mongolia issue until after the outbreak of World War I, Germany would first defeat Tsarist Russia and lose its armor and become a defeated army, and the troops pointed directly at the front line of the Riga Bay to the Transnistria River; Russia's domestic economy collapsed, factories collapsed, unemployment rate increased sharply, arms supply was extremely difficult, soldiers were extremely tired of war, and there was constant protests on strikes, and the February and October Revolutions would soon break out one after another. By then, Russia would be unable to take care of the slug thousands of kilometers away. The tanks under Sun Yuanqi were also formed, and he could sweep the rebels in the north with confidence and boldness!

Unexpectedly, the Outer Mongolia rebels were not willing to wait these days, and they repeatedly challenged Sun Yuanqi's bottom line. If a tiger does not show its power, you think I am a sick cat!
Chapter completed!