Not just any stone can be used to make a stone knife.
Stones with different colors and complex patterns cannot be used because these stones have uneven texture, are brittle, and are not hard enough.
Stones that are yellow in color cannot be used. These stones are basically sandstone and quartz, which are brittle.
If you want to look for it, look for the kind of stone with uniform color, dark tone, smooth surface and even texture distribution.
This kind of stone is hard enough and has the potential to be processed into stone weapons.
Obsidian, flint, and jade are the best stone tool materials.
Fang Yu looked around but couldn't find anything that looked like flint.
Of these three kinds of stone, flint is the most common and is distributed all over the world.
Obsidian is generally found near volcanic activity, not to mention jade, both of which have certain geographical requirements.
Unable to find flint, Fang Yu could only pick up a few unknown dark and round stones in the sea.
These stones should have been formed by erosion and erosion by sea water over a long period of time.
The wheel hardness is also very high.
After Fang Yu picked the stones, she took them and walked back towards the lifeboat.
After arriving, Fang Yu put the few stones he picked out on a nearby rock and knocked them against each other.
Gently crush the edge of a long pebble, and crush the oval edge into a blade shape.
When knocking, be extra careful not to break it or make a big gap in it.
During this period, when the oxygen content dropped to 10%, another warning was issued, prompting to replace the gas bomb.
Fang Yu ignored it and continued to knock the stone carefully for a long time. After knocking out the edges on both sides of the long stone, he raised his hand and saw that the oxygen content was only 3.
%!
Although Fang Yu is very confident, the air outside should be aerobic and has been tested.
But he still feels a little uneasy.
Anyway, he won't take off his helmet until the oxygen is used up.
I checked the time again, and it was at least two hours since the sticks were set up.
Fang Yu came to the beach again.
Looking at the unmoving shadow, Fang Yu felt that the scientific outlook he had held for many years was gradually collapsing.
what's going on?
This means...will the sun not move?
No, it’s not that the sun doesn’t move, it should be the planet under my feet!
The change of day and night is caused by the rotation of the planet.
The length of day and night is due to the blue star under your feet revolving around the sun. It is hot when it is near and cold when it is far away.
These principles have been taught in elementary school.
According to this principle.
Now comes this unusually long twilight.
The most likely possibility is that there is something wrong with the rotation of the blue star under your feet!
The rotation speed slows down, resulting in longer day and night hours.
For more than two hours, the shadow has basically not moved, so if my guess is correct.
The setting sun in front of me will last for at least a week!
Dusk lasts for about a week, and then turns into night. If calculated in the same proportion, then this night may last for a month, and then turn into day again.
There are one month of day, one month of night, and there are only six changes of day and night in a year!
And if the rotation speed is slower than Fang Yu expected, or even stops!
All illumination is no longer maintained by rotation, but only by the blue star's revolution!
As a result, Blue Star's day and night changes are estimated to be only 1 to 2 times a year.
Such changes will bring extremely terrifying environmental changes to Blue Star.
Just what Fang Yu could think of were serious consequences such as magnetic field disorder, extreme temperature difference between day and night, mass death of species, serious damage to the earth's environment, etc.
And it is very simple to prove your idea.
Let's see how long this sunset lasts.
Or, if you have the chance, sail toward the equator.
If the Blue Star really stops rotating or slows down, then Fang Yu can "chase" the sun all the way.
Either step into the night, or chase the morning in reverse!
"Beep! Beep! Beep! The oxygen is about to run out, please replace the gas bomb immediately!"
The rapid beep woke up Fang Yu.
He knew that he would face another challenge.
There was only 2% oxygen left in the air bomb. All he had to do now was to take off his helmet and manually replenish the air bomb while breathing outside air.
Maybe he was frightened by his own imagination just now.
Facing this sunset that might last for a week or even longer, Fang Yu suddenly felt that it was no big deal to have no oxygen.
If there is really no oxygen, that would be better!
Whoever likes to be treated in this ghost world is treated as such!
Blue stars can stop their rotation. Is this a world background set by carbon-based organisms?
Fang Yu stretched out his hand unfamiliarly and clicked on the buckle of his helmet.
With a click, the helmet bounced off the clothes around her neck. Fang Yu raised her hand, took off the helmet, and then took a deep breath without hesitation!
The air is sultry, mixed with the strong smell of sea water, and the smell of the earth on the beach.
There seems to be oxygen in the air, but it always feels like it's not enough.
When breathing, you always have to inhale for a long time to feel that enough oxygen has accumulated in the lungs, and then exhale the waste gas.
It feels like being trapped in a cave.
Even breathing requires effort to maintain adequate oxygen.
Because oxygen was not supplied in time, Fang Yu's body began to spontaneously release signals.
What was reflected externally was that Fang Yu's mood became inexplicably irritable.
In fact, this kind of oxygen is enough for the body to move normally, although it will be a bit strenuous.
However, the human body is also a very pampered creature.
Breathing was effortless before, and it has long been accustomed to it. But now, if it suddenly breathes a little unnaturally, it will "protest" and make the body become irritable unconsciously.
Any oxygen-breathing organism whose essential need for oxygen can be regarded as a deep oxygen dependence.
Addicted to oxygen, lack of oxygen will cause severe withdrawal reactions.
Fang Yu knew this, and he also knew that since he had oxygen and could breathe, he would not die from lack of oxygen.
At most, this slight withdrawal reaction made him a little irritable.
But he needs to know whether the air here will cause harm to the body, and for this he needs to take a risk.
I hope that the external oxygen will not cause brain damage due to insufficient oxygen supply!
After sighing, Fang Yu directly used the perseverance skill to suppress the inexplicable irritability.
After setting "calm down" as the goal, Fang Yu's mind suddenly calmed down, and her originally rapid breathing began to become smoother and longer.
Now Fang Yu's breathing state is very similar to when he was sleeping, taking long breaths and exhaling, and the sound of his breathing could not help but become louder.
Fang Yu raised her hand and set the timer for another two hours before starting to fumble around her right leg.
This oxygen bomb was installed on the side of Fang Yu's right thigh.
After previous encyclopedia inquiries, Fang Yu already had a simple understanding of this set of protective clothing.
So, I fumbled around on the side of my thigh and opened a pocket zipper.
Fang Yu thought it was a pocket before, but after opening it, it was empty and could not contain anything.
Now Fang Yu knew that this was the air chamber, and continued to fumble to find the hidden button of the air chamber.
Through rotation, the live buckle of the air chamber twists and the chamber cover pops up.
Take out a black metal tube from the air tank.
This black cylindrical metal tube is the so-called air bomb!
