In the endless flat snowfield, a puff of dry snow suddenly throws into the air and finally falls on the ground.

Having never been to the north in winter, it is difficult to understand what dry snow is.

Grabbing a puddle of snow and squeezing it hard, it couldn't form a ball at all, like dry flour, and the snowflakes fell one after another, raising a little white dust.

The drone flew up, and when I looked down, I found that someone had dug out a shallow strip on the flat ice field, and Bi Fang squatted in it, shoveling out the broken ice.

He tied the two knives together at a ninety-degree angle to form a standing shovel, with another knife in the middle to prevent them from coming together, and wrapped the body of the third knife with rope as the grip of the shovel.

This is much more convenient than chiseling with a knife.

This is the snow trench, and the main purpose is to protect against cold winds.

It's still on the road, and the need for shelters doesn't need to be too high, which would only result in wasted costs.

Bi Fangdo rested in it for a while, and continued: "It is easy to understand that there is a lot of snowfall, the extremely high snowfall frequency has caused a large amount of snow on land, and the snow here will not melt, so it will exist until the next spring. ”

"There is no snow on the surface of the sea, and the snowflakes will quickly dissolve when they drift into the sea, and as the sea ice gradually expands, the snow on the new sea ice must be thinner than the old ice."

"It's a way to judge whether you're moving forward correctly, but it's not so easy to use elsewhere, first of all, in cold areas, then offshore, where seasonal land such as ice sheets will form, and finally it will snow a lot, which is a way to adapt to local conditions."

[There is no other place to use it except Greenland (cover your face)]

[Learning is wasted, learning is wasted]

What if I don't know where I am? 】

[Capture alive an honest man who really wants to learn his skills!] 】

[Lao Fang actually taught before, a sun, a piece of paper, a pen, a miracle]

[The latitude and longitude are calculated for you, buddy, have you ever seen the inverse trigonometric function of pen calculation? ] 】

Many new viewers who haven't watched the old video are stunned, without a calculator, can you still calculate inverse trigonometric functions!?

Every video has old viewers, and there will inevitably be an influx of new viewers, but it doesn't matter, there will always be enthusiastic fans to help popularize science.

The importance of class representatives is highlighted.

At present, there are many representatives of professional courses in Bi Fang's live broadcast room, and as long as there are water friends who ask, they can even give accurate answers in the first few minutes.

[Can inverse trigonometric functions still be calculated? 】

[Theoretically, all mathematical formulas can be calculated in writing... 】

[Actually, I want to say that those who understand will naturally understand, and those who don't understand will not understand anything]

[Understand, before becoming an adventurer, Fang Shen was also a brilliant mathematician, geographer, biologist, meteorologist, physicist, chemist, historian, naturalist, etc., didn't he come to the North Pole to feed polar bears with two brushes? 】

[Polar bear (pushed away in disgust): This meat is too thin, we don't eat it]

[The words are very moist]

[I'm fat enough, will it eat me?] 】

The snow trench does not need to be built too much, and Bi Fang stopped moving after the depth was more than 60 centimeters, and the snow was thick and dug for 30, and the remaining 30 were on the ice, so that Bi Fang's hands were sore, and the sky was dark.

How thick the ice is, he himself does not know, but with a conservative estimate in meters, if you want to dig a hole to fish, it is simply impossible, the deeper the ice, the higher the hardness, and today you can only starve.

In less than seven hours, it was dark in about six hours, and it really stunned everyone, and they had never seen such a short day, as if they had done nothing, and they were about to sleep halfway.

Bi Fang walked out of the pit and piled up the snow he had just dug up on both sides of the trench, and the base was high.

I also compacted the nearby snow hard, but it was dry snow and could not be made into snow bricks.

Bi Fang took out all his ropes, pulled the ropes left and right as if weaving, and then dripped warm water on the folds on both sides, and the liquid quickly condensed into ice at low temperatures, freezing the ropes.

"There are no branches and other items as roofs, we can use ropes, leaving two or three centimeters in the middle of each one, which is enough."

When everything was pulled, a relatively sparse net appeared in front of it, leaving only space for one person to enter at the end.

Bi Fang piled all the snow on the net, which also formed an impermeable roof.

Entering through the gap, Bi Fang's hot air blocked the cold wind, and he felt his body quickly warm up.

"The igloo and the igloo can trap heat, but unlike the house, it is minus 40 degrees Celsius, to minus 10 degrees, five degrees, at this temperature the ice and snow will not melt, but we can clearly feel the warmth."

"-5 degrees Celsius is not cold at all, it is a normal temperature for human activities."

Bi Fang huddled in the corner, chatting with the audience, and it was too early to go to bed, and he told the story of the Vikings from before.

The audience is also curious, what is the end of the Vikings?

"The Vikings stayed in Greenland for a long time, from the 10th century to the 14th century, when Greenland had a relatively mild climate that allowed for grazing, and settled Vikings could rely on reserves for the winter."

"Later, when the climate changed, production could not be sustained, and the Vikings could not make a living like the Inuit, so they could not survive."

"It was the Xiaoice Age, and the route from Iceland to Greenland was blocked by ice floes. Greenland doesn't have timber for shipbuilding, and even if the sea route is clear, I am afraid that it will not be able to walk. ”

"In 1408 there was a wedding in the Hvalsey church, the last record of the Norwegians in Greenland. Since then, Greenland has been in contact with Europe, and there has been no more news. It can be regarded as the 'extinction' of the Vikings in Greenland. ”

"It could be said that this was a joke that nature played on the red-haired Eric, who just happened to be on the best date in Greenland."

"When the Vikings first arrived in Greenland, it was during a brief medieval warm period, and they were deceived by nature, so to speak."

"Since time immemorial, Greenland, like other polar regions, has experienced many climate changes that have affected the growth of local flora and fauna, as well as the survival of indigenous peoples. In addition to the Vikings, there were also Inuit people who settled in Greenland during this period; The former became extinct, and the latter successfully overcame the challenges of the Xiaoice Age. ”

There was a lot of people who came to Greenland, but the only ones who really survived for a long time were the Vikings and Inuit.

After the Ice Age, the Vikings declared their defeat, but the Inuit endured.

This is a race in the snow and ice.

Bi Fang used the example of the Vikings to warn himself about the cruelty of nature, but he had to pick up the experience of the Inuit and arm himself.

"The lessons of the former are what we want to avoid, and the latter is the key to whether I can succeed in this challenge."

------Off topic------

The hottest place in the world is not in the African desert, but in the United States' Death Valley located within the state of California.

On July 10, 1913, the desert valley of Death Valley reached 56.7 degrees, the current Guinness World Record holder.

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