Bi Fang rode a camel and galloped wildly in the desert, raising a cloud of wind and sand.

Behind him, the pyramid gradually shrinks and eventually disappears above the horizon.

After being delayed by the mummy for two days, Bi Fang did not forget his business, and the prompt for the completion of the mission through the Sahara had not yet appeared.

The surrounding scene gradually changed, from the sand dunes to the sandy land, and then to the grassland, the surrounding colors gradually became rich and bright, as if they were far away from the manic fire world of yellow sand.

Eventually, a drone in the sky captured a river above the ground.

A canopy-like reed-like plant grows on the side of the riverbank, swaying in the wind, verdant and verdant.

Summer, although hot and dry, is also a season full of life.

Climbing over a hillside, Bi Fang looked down on the deep, wide river at the highest point, the longest river in the world.

When you see this incomparably wide river, everyone invariably rings its name in their minds - the Nile!

【Nile! Nile! Nile! 】

[Chong Chong Chong, succeeded, really crossed the Sahara!] 】

[No. 1 in the world!! 】

What is a world-class explorer!! 】

[Presented to the anchor spaceship *66 by Lord Mu - the world's first!! 】

[Soar into the Sky and give to the streamer's spaceship*6 - the world's first!! 】

[15 centimeters for the anchor spacecraft*1 - the world's first!! 】

Bi Fang got off Alpha, stepped on the hillside and then a few grains of sand and slid straight down, staggered a few steps, and stopped on the bank of the river.

Two months, two months, he could clearly feel the changes in his body, like a sponge that was constantly absorbing water and being squeezed dry again and again.

Tiredness, sleepiness, hunger, thirst, heat.

Excited, excited, full-fed, lanze, shady.

Complex emotions and physical sensations are intertwined, forming a large web of memories, which are gathered into a fruitful fruit, which is knotted in the forest of memories, and finally crumbling, falling from the branches and falling into the soil.

Rooting, germinating, branching, and leaf opening, and finally turning into a towering tree, completely becoming a member of the forest.

Bi Fang's eyes became brighter and deeper, and the tiredness of his mixed body was swept away.

[Congratulations to the host for completing the task: ocean currents, crossing death, leaving behind the ancient tomb, reward statistics]

[The final rewards are: Advanced Skill Enhancement Coupon x2, Muscle Mastery Enhancement Coupon x1, Mitochondrial Enhancement Coupon x1, Enhancement Points *5, Wilderness Points *5047.] 】

Bi Fang's happy smile was a bumper harvest.

But he temporarily suppressed the system prompt, and refocused his attention on the river in front of him, as if a heroic spirit rose in his chest.

"In northeast Africa, where Egypt is located, most of the territory is desert Gobi, and the climate is dry and rainless, even if today's technology is advanced, its development value is not very large."

"It was by the Nile that the civilization of ancient Egypt was forged."

"Nourished by the Nile River, the ancient Egyptians multiplied and created the ancient Egyptian civilization that was unparalleled at that time."

"The Nile River is the longest, but it can provide limited freshwater resources, with an annual runoff of only 84 billion cubic meters, which is a drop in the bucket compared to the 950 billion cubic meters of annual runoff of our Yangtze River."

"The amount of runoff determines the amount of freshwater resources, which are the basic resources for human production and life, and the amount of river basin area directly determines the living space of human civilization."

"But it has a flood period of blessings in disguise."

"The Nile River is characterized by regular flooding, which usually starts to rise in May in northern Sudan, reaches its highest level in August, and then gradually decreases to low levels from January to May."

"Although flooding occurs regularly, the amount of water and the timing of high tide vary greatly."

"The cause of this phenomenon is the Blue Nile and Atbara rivers, which are fed by seasonal heavy rains on the Ethiopian highlands."

The audience listened patiently.

They knew that the three-month live broadcast was coming to an end.

Now it may be the last live footage.

More than 80% of the Nile's water is supplied by the Ethiopian highlands, with the rest coming from the East African highland lakes.

When the flood comes, it will inundate the farmland on both banks, and when the flood water recedes, it will leave a thick layer of silt, forming fertile soil.

Four or five thousand years ago, the Egyptians knew how to grasp the laws of the flood and use the fertile land on both sides.

For a long time, the Nile Valley has been a stretch of cotton fields and fragrant rice flowers. Sandwiched between the Sahara Desert and the Arabian Desert, the meandering Nile River is like a green walk, full of infinite life.

"The river carries the black soil of the East African plateau down until it slows down in the middle and lower reaches to form a moist and fertile area."

"So, the ancient Egyptians only had to sow the seeds in October every year, and God would appreciate it, and the next spring would be a great harvest, and because of the hot climate, the crops could reach an astonishing three crops a year."

"According to the Greek Dodd, the farmers there simply waited for the river to flood out of its own accord, to flow into the fields for irrigation, and then to return to the riverbed, and then each man scattered the seeds on his own land, and told the pigs to step on the seeds, and then they just waited for the harvest."

[This is too grassy]

[It's this Dodd again, the appearance rate is too high]

[Maybe you can give the entrance fee (dog head)]

Bi Fang whistled and let the alpha who was watching on the hillside come down.

The huge alpha looked at the steep slope of the slope, tried many times, and finally carefully stepped on the dirt slope, sliding little by little, to the bank of the river.

In this way, Bi Fang led the camel and walked beside the Nile, feeling the water vapor on his face, and every deep breath seemed to nourish the lungs filled with wind and sand.

"This kind of farming method of relying on the sky for food is most suitable for the level of early human development, and the Egyptians in the Nile valley easily enjoyed the fruits of agriculture in ancient times when production technology was extremely low."

"With a sufficient material base, ancient Egypt also became the first country in the world to break away from primitive tribal forms and establish slavery."

"However, there are so many rivers in the world, not only the Nile River will flood, the world's four major rivers, basically every one of them will be like this, but the Nile River Basin is a typical tropical desert climate, although the temperature is hot all year round, but as long as there is water, coupled with fertile soil, at any time, as long as there are seeds into the soil, crops will naturally grow well."

"For example, although the Yellow River floods regularly in summer and autumn every year, the flood season is over, the weather is already cold, and the winter is even more frozen, and even frozen."

"Everyone knows that the temperature is too low for crops to grow naturally."

"When the temperature rises in the spring and summer of the next year, the seedlings in the field have not yet grown and lived, and the flood season is coming again, when the flood is irrigated, the dry land has become a paddy field, and the Loess Plateau is not a water town in the south of the Yangtze River, and if you can't grow rice, you can only suffer."

"Therefore, the people in these places only found some high-lying mountain and forest areas to live in, and the corresponding agricultural harvest would be reduced a lot, so there was not enough material guarantee to build a relatively large and advanced national civilization form."

"And the tropical desert, which covers almost all of Egypt's territory beyond the Nile Basin, has also become an important factor in Egypt's leading world."

"Many people may doubt that tropical deserts are suitable for human survival, which is of course justified, but in a special historical period and special environment, there are exceptions."

[Is it so complicated?] 】

[Human development ultimately depends on the earth]

"There's more complicated."

Bi Fang casually folded off a piece of papyrus that looked like a reed.

"The tropical desert has two characteristics, one is the fluidity of the sand, which determines that it can fill the ravines, but it can't build high mountains, so the desert area must be flat, don't look at the sand dunes seem to be very high, but dozens of meters, a hundred meters, is just a small slope."

"The second is the extremely arid climate, which determines that the evaporation of water in the desert environment is extremely amazing, and at the same time, the water permeability of the sandy surface is better, and the absorption capacity of surface water is stronger."

"These two points seem to be insignificant, but they are extremely important for the formation and development of early Egyptian civilization."

"The terrain is flat, so when the Nile floods, it can cover a large area."

"Second, fertile plains can be formed when the desert around the basin is washed away by the fertile soil covered by the floodwaters of the Nile during the flood season."

"When the Nile floods, there will be no large lakes and swamps around the Nile after the flood season due to the huge evaporation and strong permeability to the surface, plus the natural characteristics of sand cutting mountains and filling gullies."

"To say this, it may now be a great disadvantage due to the serious lack of natural water storage, but five or six thousand years ago, it happened to be very beneficial to the development of Egyptian civilization."

Lakes and marshes have the function of natural water storage, and it is difficult to develop and utilize.

If it is to be used for agriculture, it needs human beings to build dikes and dams, and open canals to guide it.

As for swamps, it is more difficult to develop into farmland.

The Egyptians, who lived for thousands of years, could only rely on the sky for food, and their technology and resource reserves were extremely backward, and they could not make effective use of the lakes and marshes.

Not to mention building dikes, even water canals are not very useful.

There is no such ability.

The special geographical environment of the lower reaches of the Nile does not have the possibility of forming large lakes and marshes.

The area around the flooded basin has plenty of water and fertile soil that is the most suitable place for primary agriculture, and Egyptian farmers can sow and harvest to their heart's content.

This is something that many other regions do not have.

"In the middle and lower reaches of the Yellow River, until the period of the Three Emperors and Five Emperors, human beings were still fighting against floods desperately."

"It wasn't until Dayu succeeded in controlling the water that we finally had a certain scale of farmland, from which we could obtain enough resources to support ourselves to complete the evolution from primitive tribes to national civilizations."

"After the death of Dayu, his son Qi established the Xia Dynasty, the first dynasty in Chinese history."

【Dayu is awesome!!】 】

[Society, my brother Yu! 】

[It's got to be us!] 】

Bi Fang smiled.

"Huaxia is facing greater pressure to survive, so it quickly pointed out the technology of dams and canals, which can use the lake, but the development is the last."

"The current tropical desert environment and the Nile River, where there is still a good life of human beings, but at this time, thousands of years ago, the ingenious combination of the two gave birth to the leading civilization of ancient Egypt at that time."

"If we expand further, we will find that the fundamentals of the advanced civilizations of antiquity are very similar to those of the Nile."

"Among the four ancient civilizations, except for Egypt, the middle and lower reaches of the two river basins where Babylon is located, and the middle and lower reaches of the Indus River basin, where India is located, are all a combination of large rivers and tropical desert environments, with the exception of China."

Those who could have sent a flood fled.

Those who do not make a big flood do not point out higher development technology.

Only Huaxia is the only one of the scorpion baba, not only did not escape, but also cured the water.

"In short, due to the extremely low ability of early human beings to transform nature, the emergence and development of civilization is extremely dependent on the innate natural environment, and the role of human subjective initiative is too small."

"In this case, only if the innate environment is very suitable, and only a small amount of low-level farming skills is required for human beings to have the possibility of producing enough food, can the first civilized country be born."

"So everything is not static, it's always changing."

"At the beginning of the development of civilization, this combination of tropical deserts and large rivers had obvious advantages, but with the progress of human civilization, its disadvantages gradually appeared."

"After all, the development potential of desertified land is limited, and when human technology develops to the point where it is capable of fully exploiting difficult plots such as lakes and marshes, Egypt will be slapped to death on the beach by the back waves."

"Among the four ancient civilizations, although China was formed relatively late, it came from behind and became the boss in one fell swoop."

"Indian civilization arose in the Indus Valley, but its center shifted with the development of the Ganges Valley."

"Although the two river basins where Babylon is located have always maintained the status of a first-class geopolitical plate in the Middle East, the preservation of this status is largely due to the advantages of its geographical location, but with the production potential of the plate itself, it has long been left far behind by China and India."

"Although Egypt is the forerunner of the four ancient civilizations, it is also the most completely declining."

"As other plates developed one after another, they successively surpassed Egypt's comprehensive strength, and when the geographical strength of these plates developed to the ability to expand externally, Egypt was reduced to the object of conquest by foreign forces."

"Persia, Macedonia, Rome, Byzantium, Arabia, and the Ottoman Turkish Empire all strongly incorporated Egypt into their territory."

[Hey, feng shui takes turns]

[There is no eternal empire]

[Is it about to end?] 】

Bi Fang used his fingernails to peel off the outer skin of the freshly folded papyrope stems, and then used a knife to cut them into long strips in the direction of growth, and placed them horizontally and vertically.

"See the 'reeds' in my hands? This is not actually a reed, but a papyrus, a plant that resembles a reed and is abundant in the Nile Delta. ”

"I think I cut it like this, then overlap it, and then hit it with a mallet so that the grass juice seeps out, and when it dries, the strips stick together permanently, and finally polish them with pumice stones, so that they can be used as paper."

"This was the world's most advanced writing medium at that time, papyrus, which became an important document for later scholars to study ancient Egyptian civilization."

"But because papyrus is not suitable for folding and cannot be made into a book, many papyrus pieces must be glued into long strips and rolled into a roll after writing, which becomes a scroll."

"So we can often see that some ancient documents in the West are scrolls, if it was in ancient times, maybe my adventure this time would be recorded on such scrolls, passed down from generation to generation, right?"

Taking a little knowledge as the final conclusion, Bi Fang did not delay any longer, and gave a two-finger salute to the drone that was gradually rising and flying across the Nile.

"This time the story ends here, but this is not the end, I'm Bi Fang, we'll see you next time."

As the drone flies over the Nile, through a small oasis, it turns into a black dot.

Disappear.