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"This last lesson for you today is also my last class before I retire, after taking your class, I will officially retire......" At the beginning of the second naturalist class, the first sentence of the naturalist teacher's mouth made the whole classroom fall into absolute silence in an instant, even Zhang Tie did not expect that today's class would be the last class of this teacher, since entering the seventh middle school, he seems to have been accustomed to this old man with a completely gray head coming quietly during class, Walking quietly at the end of class, I never thought that one day this old man would say goodbye to everyone on the podium, as soon as the teacher of the naturalist class said it, even the guys in the classroom who were still sleeping to make up for the doze seemed to wake up, and looked at the old man in front of him in amazement. I started to feel a little reluctant.

"Teacher, are you really leaving......" a guy in the front row asked everyone.

"I'm old enough, and I've served Black Flame City long enough, it's time to retire!" The old man on the podium smiled kindly, "I know what everyone is worried about, as long as the walls of Black Flame City are not breached by aliens, my pension should be enough for me to enjoy my old age, and if the walls of Black Flame City are to be strong forever, it depends on you and not me, so how the teacher's future retirement life will be, I can only ask everyone!" Because of this, in today's last naturalist class, I will use my life's experience and insight to tell you about the issues that everyone is most concerned about, what is the road of a strong man who has the ability to protect the human race! ”

The old man's last words shocked everyone's spirits, and everyone straightened up all of a sudden, looking at the old man who suddenly made everyone feel reluctant and respectable.

The old man didn't speak, but took out a small ordinary snail shell and two pine cones from his pocket, came down from the front row, and let everyone pass it to see, in a minute, the two ordinary things were passed in everyone's hands from top to bottom, there was nothing special at all, Zhang Tie took the two things in his hand and looked at them over and over again for a few seconds, and he didn't see anything famous.

"Do you have any special features about this snail shell and these two pine cones?" The old man asked.

Everyone shook their heads.

"Do you know that the mystery of the path of a human race powerhouse is hidden in these ordinary things? You all know that a person can continuously improve his strength as long as he constantly ignites the bright points of his body, but what is the standard for the division of the strength of the Terran warriors, why are some people at level five, some people at level six, some people at level seven, and some people at level ten or higher, who gave us the ranks and ranks of the warriors of the Terran race, and did some big people in the Warrior Guild come up with it with their brains? ”

Zhang Tie was also stunned, in the past, Zhang Tie really thought that these standards were formulated by those big people, didn't he?

"Of course not, in this world, who can have the right to set such a standard and let hundreds of millions of races and those endless strong people obediently pursue it?"

"Teacher, who is the person who sets this standard?"

"It is not man who sets this standard, but God or the great law of the universe!"

The whole class of cattle was in an uproar and there was a lot of talking.

"This standard is not specially formulated for the human race, but the laws of the universe for the one qiē of this universe, and there is also such a standard on the snail shell and pine cone I just handed over to you, but everyone does not show it!" The old man stood on the podium and then turned around and drew two patterns on the blackboard with chalk, one of which was a spiral curve resembling a snail's shell, and the other was a pattern of intersecting lines similar to those of a pine cone.

After drawing these, the old man turned around, "How many bright spots does a first-order soldier want to ignite on his body?" ”

"One, you can ...... by lighting the Shrine and lighting it," everyone answered a question. Then the old man drew a square in the center of the curve of the snail shell, and let the spiral curve pass from the beginning between the two opposite corners of the square......

"What about the second order?"

"It's still one, you can ...... it by lighting the tail vertebrae of the spine."

The old man expanded the icon again, drawing a square of the same length.

"What about the third order?"

"Just light 2 spine spots!"

This time, the square wrapped in the curve was doubled in terms of side length.

"What about the Fourth Order?"

"Three!"

"What about the fifth order?"

"5 pcs"

"What about the Sixth Order?"

"8 ......"

As the old man asked every time, the spiral curve on the blackboard was wrapped in various squares that appeared in the same proportion with increasing side lengths, and in the end, when the old man asked about the tenth order, no one in the class could answer, the world of the warriors above the tenth order was completely beyond the limit of what the cattle could look up to, and that world, for everyone, was as far away as the cataclysm......

Instead of laughing at everyone, the naturalist teacher wrote on the blackboard a string of numbers that everyone had just answered - 1, 1, 2, 3, 5, 8, 13, 21, 34...... Then write the corresponding level and rank under the number, starting from the first level corresponding to 1, and continue to the ninth level corresponding to 34, and finally turned his head and looked at everyone with blazing eyes, "Don't you have a pattern in these ignited numbers that represent levels?" ”

After staring at the line of numbers for a while, someone finally realized, "Teacher, the last one of the numbers in this row is the sum of the first two numbers!" ”

"What else?"

Zhang Tie looked at those sequences, and there was something in his mind that wanted to pour out, but he couldn't grasp it.

"Do you count the quotients of two adjacent numbers in these numbers, and see what the pattern is?"

The quotient of the first is 1, the quotient of the second is o.5, the quotient of the third is the infinite loop number of o.66666, the quotient of the fourth is o.6, the quotient of the fifth is o.625, the quotient of the sixth is o.61538......, the quotient of the seventh is o.619o47......, and the quotient of the eighth is o.617647......

"Do you have any of these values in the end, and they are getting infinitely closer to the golden number of O.618...... "The old man solved the mystery, and everyone realized, yes, why is this happening.

"The bright point of the shrine is 1, and the spine of the human body has 34 segments, when starting from the shrine, all the bright points on the spine have been ignited, that is, the sign of becoming a level 9 warrior, this leap forward of each level, there are strict standards, knowing this law, you calculate the number of bright points that need to be ignited to become a tenth-order warrior? 55 is not, and then it is behind, 89 is not, the more you go to the back, the more terrifying this number will be calculated, it is simply increasing in geometric progression, which is the reason why the difference between rank and rank is the later the greater the disparity in strength, and this number series ......" The old man turned around and pointed to the column of numbers written on the blackboard, "It is called the Fibonacci sequence, which is a golden sequence of golden numbers that have hidden countless mysteries by human mathematicians hundreds of years before the cataclysm, which contains the laws of the universe and creation, Let's look at the spirals around the two pine cones, count, is it the small one on the left has five, the right has eight, and the big one has eight on the left, and the right has thirteen, 5, 8, 13, these three numbers are not in the Fibonacci sequence, you just saw the curve of the snail shell, I drew it on the blackboard, you only need to look at these squares on the curve of the snail shell to understand the relationship between this curve and this sequence, this curve is called the Fibonacci curve, Also known as the golden curve, is the geometric table of this number series xiàn form, this golden number and gold curve, can be found in almost any creature can find its corresponding place, if you pay attention to the observation of nature and things around you, you will have more present, you can observe the sunflower flower plate, there are also two groups of spirals, 34 and 55, 55 and 89 and 89 and 144 these three groups of numbers, in roses, thistle leaves and other plants, we will also have the same present. After the cataclysm, human beings have revealed the mystery of human cultivation from the ruins excavated from the underground world, and the path of human advancement and cultivation is advancing along such a golden curve and number series drawn by the Lord of Creation, and all living beings are moving along this curve, and this curve and number series are the embodiment of the laws of the universe, so the warrior rank divided by this curve and number series can be unanimously recognized by all races and all strong people......"

All the animals had an eye-opening feeling when they heard this, including Zhang Tie, in the past, he only understood that in order to advance, he had to constantly ignite the bright points of the body, and the number of bright points that needed to be ignited at each level was also different, but why this was so, he didn't think about it carefully, it turned out that all the secrets of the one qiē were hidden in the golden spiral and the cosmic laws contained in the number sequence.

"Teacher, after the tenth level, what is the highest level of the cultivation rank?" It was Baghdad who raised his hand below and asked a question.

"No one has been able to answer this question until now, because the cultivation after the tenth level is the biggest secret everywhere, and the knowledge after the tenth level is the secret transmission within the secret tradition. The bigger reason is because there is no end to the golden sequence, it is just approaching in continuous expansion. Constantly approaching the o.618 that represents the most perfect law of God and the universe, human beings have re-embarked on the path of cultivation, stepped on the golden spiral, and began to re-excavate the treasure of their own body It has been less than 9oo years, and the evolution of the universe may have been tens of billions of years, in the journey of that golden spiral, human beings have just begun to start, before the cataclysm, human beings have always been very blind and arrogant, thinking of themselves as the masters of the universe and all things, and after the cataclysm, human beings understand that the so-called human race is only an insignificant member of the countless races in the universe and Kunang Da6, and it is even very likely that a considerable period of time has passed before the cataclysmWhen human beings have no way to retreat, the cataclysm and the Star of God came, and a qiē was rewritten, in order to survive, human beings showed the mystery of the bright point of the body, and began to embark on the path of evolution again, the Black Iron Age, is the final end, and a new beginning......"

In this last naturalist class, the teacher opened a window for everyone that everyone had never thought of to see a wider world. At the end of the lesson, everyone was manually calculating how far the golden number would go next.

1，1,2,3,5,8,13,21,34,55,89,144,233,377,61o,987,1597……

When advancing this golden number series to the seventeenth place, Zhang Tie was dumbfounded, he looked at the seven numbers behind him in disbelief, could this be the world after the tenth level......