Lightning strike?

The audience was dumbfounded.

Bi Fang explained in layman's terms.

"The first field tests in Western Sahara showed that when the grains of sand blown by the wind rub against each other, an electric field is generated."

"When this happens, the smaller dust particles usually absorb electrons from the larger dust and thus take on a negative charge themselves."

"As a result, dust particles are more likely to be blown into higher air, while positively charged sand particles tend to be closer to the ground. This separation of charges creates an electric field that electrifies the dust trapped in the sand, causing it to flow more into the air, creating a larger storm. ”

"This ball has lightning not only downwards, but also upwards."

[Hey, that's too dangerous, isn't it?]

[The knowledge of cowhide has increased]

[Anyway, I've never heard of it.] 】

"It's right that I haven't heard of it, because the probability of this kind of event itself is not very high, and I don't seem to have heard of anyone who encountered a sandstorm and was killed by the lightning inside."

【Too Hell】

[I haven't heard of it either]

[In short, celebrate, it's another day of racing against death]

[Behind Fang Shen's ass is a rocket, right]

[Death is like the wind, always with me, but it can never catch up]

After surviving the sandstorm crisis, Bi Fang continued on his way with Alpha, only this time he did not choose to control the reins, but let them droop freely.

There are many ways to get water in the desert, but since you have camels, there is no need to choose those that are complicated and slow to work.

"As I said before, following animals can undoubtedly find water and even food, but animals here definitely don't include those who can find water if you bring a dog here."

"Almost all animals in nature have their own fixed habitat, even migratory birds, and although they migrate every year, their routes are fixed."

"They know where there is abundant water and grass on this road, where there are no predators, where they can rest safely, and they hardly change, which is why Professor Etienne would come all the way to me and ask me to help change the migration route of the white-fronted goose, if they don't change, they will be driven to extinction by the continuous urbanization of the migration route."

"Did you find out why?"

"The reason why most animals know where a water source is is is not because they are gifted with an antenna on their heads, and the antenna points wherever there is a water source."

Bi Fang put his hands on his temples, stretched out his index finger, and turned around, making a more comedic action to make the audience happy.

[It's because they live here, so they know, right?] 】

"That's right, the territory of animals is like our house, and the water source is the tap water supply in the house, as the owner of the house, you naturally know where the faucet of your house is."

"Animals get thirsty, and you know you can follow them to find the faucet, but if you take a dog and break into unfamiliar territory, you have to rely on pure luck to find the faucet."

"Almost all animals themselves don't have the ability to find water directly, so they usually don't leave their territory."

"If the faucet in the house is broken, in nature without a plumber, the animals can only move, but moving is not so easy, and it often pays a very painful price, and those who have seen the migration of the African savannah in the animal world should be very clear."

【Wildebeest!

！ 】

[Widow maker, African buffalo!] 】

[It's really shocking, every time I see them crossing the river, and then being bitten by crocodiles, and finally becoming dinner, or passing by by luck mixed with a large army]

[Humans may have to spend a lifetime of savings and labor to move, and it is not easy for animals (dog heads)]

[Almost, I guess the old side must say a special case, I guess it's Alpha]

"Clever."

Bi Fang smiled and patted Alpha's neck.

"When humans are in the desert, the biggest difficulty they face is water. If you don't drink water, you can die in a few hours in the case of dehydration. But the camels in the desert do not, they can always find the desert oasis to drink water, and they are very few animals that can actively find water. ”

"This is due to their peculiar noses, which are diagonally open and open to prevent dust from entering, and which have valve-like structures filled with olfactory cells. Not only can you look for food, but in the arid desert, on the tasteless water source, and in the long distance there is a feeling of humidity. ”

"Such a nose is enough for a camel to find a source of water more than 20 kilometers away through its sense of smell, making it have a much higher chance of surviving when crossing the desert than a human with a large bag of mineral water on its back."

"So, if you do get lost in the desert, the experienced person will no longer feed the camel water, wait a few days, let the reins loose, let it move freely, and it will look for it on its own."

[, this sense of smell is invincible]

[No matter how invincible he is, he was still caught by Fang Shen (funny)]

[Or Fang Shen is better]

[In other words, is such an awesome sense of smell more powerful than dogs and bears?] I don't think they can find water by smell. 】

"It's true that dogs and bears can't find water with their sense of smell, but to say that camels have a better sense of smell than the two of them, that's not necessarily true."

Bi Fang shook his head, making everyone a little puzzled.

"Actually, camels have less than 800 olfactory receptor genes, which may sound like a lot, but on the contrary, camels have fewer olfactory receptor genes in animals."

"There are more than 1,000 in normal humans, 1,300 in dogs, and 1,500 in more powerful mice."

"But neither humans, dogs, nor rats can locate the source of water, it's not a matter of distance, even if it's less than 10 meters, they can't know that there is water in front of them just by smell."

"The smell discrimination ability of the camel itself is actually far inferior to that of dogs, bears, and rats, which is still related to its living environment, in the desert, they do not need a strong ability to distinguish odors, because there are not many odors that need to be distinguished in the desert."

"So it's not a problem that camels have fewer olfactory receptor genes, but because there are not many smells that need to be distinguished, these olfactory receptor genes have a stronger professional division of labor, and it has been strengthened in some special aspects of smell, and its sense of smell for water and other green plants is much stronger than that of other animals!"

"In the vegetated soil, a chemical called 'geostin' is emitted. This particular smell resembles the smell of freshly turned soil and can be sniffed by camels from a distance. ”

"In fact, we can sometimes smell this kind of smell, such as the 'earthy smell' after the rain on a rainy day, which is also an earthy odor, which is essentially a metabolic waste of bacteria."

In summer, when there is a few days of drought in a row, a heavy rain suddenly washes the earth, the leaves are greener and the flowers are redder, and even the air will be filled with the fragrance of earth.

You take a deep breath and are filled with the fragrance of plants and the unique smell of earth, the fragrance of nature.

But scientists will tell you that this earthy aroma after rain is actually an organic compound volatilized by some fungus, a "smell trap" for bacteria to attract springbokas to help spread the spores of Streptomyces offspring.

[Ah this, ah this, ah this]

[I've always loved the taste after the rain......]

[It's over, I can't go back]

[What's this, we don't know how many bacteria we eat every time we breathe]

A person with mediocre talents, year after year, who concentrates on doing only one thing, can also become the best.

There are so many smells in nature, but these camels don't need them all, natural enemies are scarce, and its biggest enemy is only the natural environment, so it only needs to smell a few smells, even if the olfactory discrimination ability is a little worse, it can also make up for the clumsiness.

The reins hung down beside Alpha's neck, Alpha walked down the sun for a moment, walked straight for a while and seemed to realize that something was wrong, turned his head to look at the rope next to his neck, and for a moment did not know whether to continue moving forward, and stopped in place.

Bi Fang didn't let it stop, and gently clamped Alpha's abdomen between his legs, motioning for him to move on.

[Can you really find it?] Is there a water source in the desert?

[There must be, Oasis]

[Does the Oasis Really Exist?] I feel like it's all film and television dramas, or apocryphal. There may be one, but only a few scattered, right? 】

"You are wrong, the Sahara Desert is indeed the largest desert, but it is not the driest desert, nor is it the most monotonous desert."

"The so-called desert is more like the surface without trees, 9 million square kilometers of desert, almost the size of a Chinese country, although at first glance it is a piece of yellow, orange and orange, but the geological structure is not simple."

"For example, the four oases in Egypt, if you look closely at the terrain, they are actually located in a fault zone, and this terrain is inherently oriented, and most importantly, it will provide water."

"I told you the other day about the causes of the Sahara, I don't know if you remember."

"The desertification of the Sahara was very late, and the Nile Valley was uninhabitable before the agricultural age, because there were huge layers of rock, 100 meters thick during the ice age."

"So people are gradually moving inward from the grassland before desertification, and there must be rivers for people."

Bi Fang began to correct the thoughts of the sailors.

Prosperity is still hidden in the barrenness.

"In the early days of Egyptian civilization, the Eastern Desert, Nubia, Libya, the deserts around the Nile are not so dry, and there are many rivers."

"Egypt's exchanges with external civilizations, ore mining, timber, and even arable land itself are still very dependent on these rivers, and today's main stream of the Nile, although it is already the absolute center, is at least not the only one, and it can even be said that the Wadi Valley has a place in the formation and maturation of Egyptian civilization alongside the Mediterranean, Libya, Sinai, and Nubia."

"The Egyptian legend of the delta god Seth and the Nile valley god Horus fought for many years, and finally Horus defeated Seth and drove him into the desert to be the desert god, which clearly reflects the dignity of the valley delta and the desert, but don't forget, since the desert can be juxtaposed with the valley delta, it shows that Egypt attaches great importance to the desert."

If the so-called Sahara Desert is really worthless, and birds don't lay eggs, how can it be taken seriously?

In many local myths, some human development can be sorted out.

In areas with developed water systems, it is impossible for the locals to worship a powerful fire god, and the fire god in the system will never be able to beat the water god.

"Maybe the conditions are not so good, not so rich, but in the hearts of Egyptians, the importance of the desert in culture is several dimensions higher than the desert in the eyes of modern people."

"Even if it was true that the sky was full of yellow sand, there were a lot of oases in the desert, and a large number of human beings survived, so that they could occupy a large place in the culture."

"It's a pity that desert archaeology didn't begin until the end of the last century, and now it's mainly studied in the wadis valley in the eastern part of the Upper Egyptian Bay, and there are some discoveries in the west, but not much."

The cost of desert archaeology is too high, and it is a job that is destined to have a small input-output ratio.

It is difficult to think about searching for unclear depictions of cliffs or gravel in valleys that stretch for hundreds of kilometers, eating sand and holding a brush.

"So a long time ago, there were actually a lot of oases and rivers in the desert of the Sahara."

"Today, many of these rivers have disappeared from the surface, but they still exist in the invisible underground, gushing and continuing to feed the oasis."

The facts are as Bi Fang said.

There are a considerable number of underground rivers under the Sahara Desert, and these underground rivers have relatively sufficient water resources, and some even form small rivers directly in the desert.

With the water supply of the underground river, there will be a considerable scale oasis in the desert, on which there will be a variety of plants, and some larger oases will also live on some animals, and it is difficult for humans to imagine that you are in the desert when you come to such an oasis.

"The Kelzaz Oasis is one of the more famous oases in the Sahara Desert, also due to the formation of underground rivers, and according to the investigation, many underground rivers even have a variety of small fish, and people can fish directly in the underground rivers of the Sahara Desert."

"It's definitely a spectacle of the Sahara Desert."

[It's another day of learning from China and the West]

[Mythology Researcher, Fang Shen Profession Plus One]

[Although it's just a common myth, it still feels awesome]

It is not surprising that a mathematician is proficient in mathematics and has a good grasp of all kinds of professional problems, but if he also shows a certain literary literacy, even if he is not a professional scholar, it will still be surprising and even admirable, because this is not only the level of professionalism, but the breadth of breadth.

Unfortunately, things don't seem to be as easy as Bi Fang thought.

Alpha was unbound by the reins, and did not change direction, but walked in a straight line until hours had passed, and did not seem to realize that he could go as he pleases until evening.

For this reason, Bi Fang even hardened the midday sun to prevent interrupting Alpha's "inspiration".

The water source was already insufficient, and after an afternoon, his lips were even more chapped and white, and he couldn't even make a bigger expression, otherwise he would be chapped and bleeding.

The situation continued until eight or nine o'clock in the evening, when the moon had risen, and Bi Fang finally had a harvest.

In the line of sight, a "black spot" appeared on the vast earth.