The expedition team was investigating under the stone pillars, collecting rock and mineral samples, when suddenly a few dark clouds rose in the sky, a gust of wind blew, and the trees in the valley were blown to a rattle. After a while, the raindrops the size of beans fell and quickly wet a large piece of clothing on the body. Lao Lu shouted: "Find a place to shelter from the rain!" ”

They hurried back to the bottom of the cliff with the stone balls and hid underneath. The rain became heavier and heavier, and soon a curtain of water formed on the cliff, and they seemed to be hiding in the hole of the water curtain. The space below the cliff was about a dozen square meters, and it seemed spacious for the five of them. The temperature inside is already lower than outside, and when it rains, the temperature is even lower. Lin Xueyi's body was delicate, her clothes were already semi-wet, and she couldn't help shivering with cold.

Dong Yucheng collected the dead branches and leaves on the ground and lit a fire. The firelight shone on Lin Xueyi, and her face gradually became rosy. They didn't have much to bring, so they had to dry their clothes with their own body temperature and the fire. The rain from the heights kept flowing down, and a lot of water had accumulated in the low-lying areas of the Golden Valley.

The rain would not stop for a while, and Professor Wu Yining and the three graduate students discussed the problem again. Professor Wu asked, "If those pillars are volcanic rock, then what are the stone balls here?" What is the reason for this? ”

"Teacher, this stone ball must also be volcanic rock, and it has a similar reason to the stone pillar over there." Wu Jianjun was afraid that Professor Wu would criticize him for not thinking positively, so he preemptively answered.

"If the reasons are the same, why is one columnar and the other spherical?" Professor Wu asked.

The three graduate students couldn't figure out the reason for a while, and they were all thinking positively. Lao Lu was also listening to the side, he didn't know what volcanic rocks were, and he always believed that this was a Buddha bead. Under the influence of Professor Wu's spirit, Lao Lu is also constantly thinking, and he thinks of tangyuan from this stone ball. When cooking the rice balls at home, the kneaded rice balls were first thrown into the boiling water, and the rice balls first sank to the bottom of the water, and slowly, after the rice balls were cooked, they floated to the surface of the water, and suddenly a flash of inspiration came to him.

"Professor, could this ball of stone come out of the ground? It's like when you boil rice balls, when they are cooked, they will float up from under the water. Lao Lu also wanted to be a scholar and threw this idea to Professor Wu.

Professor Wu slapped his thigh and said, "There you have it!" The problem that you three graduate students couldn't think of was solved by Lao Lu! The analogy that Lao Lu just played has already explained to you the reason for the appearance of the stone ball. ”

According to Professor Wu, these stone balls are another special type of rock formed during volcanic eruptions, called bubble rhyolite. When a volcano erupts, the hot magma ejected from the ground contains a large amount of gas, and when the magma erupts from the surface, the pressure decreases, and the gas inside expands outward, causing the gas-encapsulated magma to become a spherical shape. After the magma cools, it condenses into round stone balls, which are geological bubble rhyolite. It's really knowledge everywhere, and Lao Lu, who farms the land, accidentally figured out the principle of the formation of stone bubble rhyolite. Just like in "Chivalrous Journey", Shi Potian is illiterate, but only he has figured out the martial arts that have plagued many first-class masters on Chivalry Island for decades.

The rain finally stopped, and a rainbow appeared in the sky, like a ribbon, on the blue sky. Colorful light illuminates the earth, like a fairyland on earth. Under the illumination of the glow, Lin Xueyi came to the world like a fairy in the sky. Dong Yucheng seemed to see Lin Xueyi fly into the sky, step onto the bridge where the rainbow was ridden, and disappear into the sky...... Dong Yucheng felt very scared, how could he have such an association, he was so close to Lin Xueyi now, who would dare to pick her up? Even the fairies in the sky can't take her away, she can only belong to the earth.

"The Buddha has appeared! The Buddha is holy! There was a shout in the distance. More than a dozen people ran out of the village and ran towards the Buddha statue in the Golden Light Valley. Under the guidance of Lao Lu, the expedition team stood in a proper position, and sure enough, they saw golden light emitting from the other side of the mountain.

"There is a Buddha statue on the other side of the mountain, I told you a long time ago, the Buddha statue will shine when it meets a destined person, it seems that you are the destined person." Lao Lu led the expedition team around the mountain, and sure enough, he saw a reclining Buddha, lying on the ground, with his head supported by his arms, looking pensive. The Buddha may be thinking about birth, old age, sickness and death in the world, everything is suffering, how can we seek liberation and reach the other side?

In front of the reclining Buddha, more than a dozen people were already kneeling and praying. Lao Lu said: "I also have to go to worship the Buddha, ask the Buddha to bless our village with good weather and good harvest every year, and also bless me not to be a farmer in the next life." ”

"Teacher, should we go and worship the Buddha?" Lin Xueyi asked.

"Is there a God in the world? Is there a God? If there is a God, you can go and worship it. Professor Wu said.

"I think there is God." Dong Yucheng said.

"You don't have a firm scientific spirit!" Professor Wu criticized Dong Yucheng.

"The God in me is the natural law of nature! The sun, moon and stars, everything in the world operates in harmony under the control of the laws of nature, and the laws of nature are God! Dong Yucheng said. It is said that Newton and Einstein also believed in God, but in fact, God in their minds is the natural law that governs the operation of the universe, not those legends in mythology. Professor Wu agreed with Dong Yucheng's view, and they all went to pay homage to the Buddha statue.

At the end of the day's expedition, Professor Wu led the expedition team back to Lu Zisu's house in the village. There are only Lu Zisu and his wife in the family, and his son and daughter-in-law work outside, and they usually go home during the Chinese New Year. The old couple depend on each other, usually grow some vegetables in their own fields, and their son and daughter-in-law send some money home from time to time, and their lives are very happy. The only regret is that the house is too deserted, and relatives rarely come. Professor Wu and his entourage lived in his house, which increased the popularity of his family, and Lu Zisu was very happy.

Six people want to eat, where can Lu Zisu and his family be busy. Although they had to pay for food, the three graduate students couldn't open their mouths like guests, so they went over to help. Lu Zisu's family's own land is at the door of the house, Dong Yucheng carried the basket to the field to pick a few bitter gourds and loofahs, Lin Xueyi went to the field to pinch a large handful of water spinach, and Wu Jianjun cut pork in the kitchen. Water spinach has a lot of yellow leaves, and Lin Xueyi used her dexterous hands to clean out the yellow leaves one by one. She thought of the school cafeteria, who would clean up as carefully as she did? Dong Yucheng used a kitchen knife to open the bitter gourd, cut out the bitter gourd seeds inside, and then cut the bitter gourd into slices. Dong Yucheng thought of eels, eels are animals, bitter gourds are plants, they are all eels and bitter gourds, why does the former look cruel, and the latter is not cruel? Is the life of an animal a life, and the life of a plant not life?

There is a lot of fluff on the loofah, Dong Yucheng scrapes off the fluff with a kitchen knife, and then cuts the loofah into long strips. Wu Jianjun's kitchen knife for cutting meat was not sharp enough, and he couldn't bear it anymore, so he sharpened the kitchen knife on the whetstone. This whetstone is very hard and dense, and in a moment the kitchen knife is sharpened so sharp that it can almost be broken. Wu Jianjun has a classmate who is studying oil and gas field development, and he heard his classmate say that tight oil reservoirs are like whetstones, and it is very difficult for oil to flow in them, and it is necessary to develop them through "making a revolution on the whetstone" and researching the world's leading technology.

A few people were busy in the kitchen when they suddenly heard the sound of firecrackers in the village.

"Oh no, there must be someone dead in the village." Lu Zisu said. In the countryside, firecrackers are only set off during festivals or birthdays, and they are generally not set off at other times. In addition, there is also a situation where firecrackers are also set off, and people are generally taboo about this kind of thing, that is, dead people.