The story of Mathematicians (within 100 words)

The story of Mathematicians (within 100 words)

Chen Jingrun, a mathematician, lived a very simple life when he was studying in University. He always wore a black student uniform. Because of his poor family, he often had two meals a day in order to spend the money he saved on buying books. He said, "you can't eat meals, you can't read books." he didn't watch movies, chatted with people casually, and devoted himself to study

Stories of famous mathematicians (20 words)

Children, do you know the story of Gauss as a child?
When Gauss was in primary school, once after the teacher taught addition, because the teacher wanted to have a rest, he put forward a question for the students to calculate
1+2+3+ .+97+98+99+100 =
The teacher is thinking, now the children must count to the end of the class! Just about to excuse out, but Gauss stopped! Originally, Gauss has figured out, children, do you know how he counted?
Gauss tells you how he works out: add 1 to 100 and 100 to 1 in two rows, that is to say:
1+2+3+4+ .+96+97+98+99+100
100+99+98+97+96+ .+4+3+2+1
=101+101+101+ .+101+101+101+101
There are a total of 100 101, but the formula is repeated twice, so divide 10100 by 2 to get the answer equal to

Mathematician's story, about 20 words, 2

When he was a child, he studied hard, but Hua Luogeng was called to see a shop (a shop selling cotton). For an internationally renowned Chinese mathematician, once a woman went to buy cotton. Hua Luogeng was working on a math problem, and the woman said how much it would cost to wrap cotton. However, Hua Luogeng, who was diligent in learning, didn't hear it and answered the answer

400 words on the experiment

Snail meets salt
This afternoon, I found a snail in the yard with a heavy shell on its back. The two tentacles on its head were swinging and there was a trace on the place where it climbed. I thought that people often said that the snail would turn into water when it touched salt, so I decided to take it home for an experiment. "Hearing is false, seeing is true."!
I took the snail home with leaves and put it on the balcony. I went to the kitchen and scooped half a spoonful of salt. In order to see it more carefully, I opened my eyes wide. The snail was still crawling slowly, and I didn't know that death was about to wave to it. I sprinkled salt. In the blink of an eye, it quickly retracted its head into the "house", It disappeared without a trace. I was shocked and said: did it really turn into water! But it was retracted! For a moment, I was a monk in law and couldn't feel my head. If I looked at it carefully, it seemed that the snail was dried in the sun. At this time, under the sunlight, there seemed to be some transparency in its shell, which was no longer the weight just now. At this time, I was even more puzzled: didn't the snail melt, But where did it go? Did it disappear out of thin air? I asked my mother, and she said that it should have been indented. So I patiently watched to see if it would come out. After the afternoon, the snail still didn't show its head, and there was no sign of life
Now it seems that when snails meet with salt, they don't turn into water. So how do they die
When a snail encounters salt, the salt will also suck out the water in the snail's body (cells), and it is a mollusk. The water in the body accounts for a large proportion. When you see the liquid, it does not melt water, but because of the leakage of water, the original volume becomes smaller
It doesn't turn into a pool of water. If you look carefully, it's just that the water in its body flows out, that is, it shrinks. This is the relationship between the osmotic pressure of the cell. After putting salt, the water potential energy in the cell is relatively large. In order to balance the water, it stays out
Because there is a layer of mucus on the soft surface of the snail, which is conducive to the movement and skin assisted breathing of the snail. When salt is encountered, the movement and breathing ability of the snail will be reduced, and the mucus will be sucked up by a large amount of salt, which will destroy the osmotic pressure balance of the snail cells, shrink the snail body, and the cells will be short of water. At this time, the snail seems to be dried in the sun, and all the water in the cells will come out
At the same time, I also learned that snails have almost as many teeth as the hair on their bodies in the world. There are not only many teeth, but also many kinds of snails. More than 25000 species have been found in the world, and there are thousands of species in China alone. I also know that snails without shells are not called snails, but "slugs"
Snails usually live in humid places, hiding from the sun in the plants. Snails living in cold areas hibernate, and tropical species also hibernate in dry season. When they hibernate, the mucus secreted forms a dry film to close the shell. The whole body is hidden in the shell. When the air temperature and humidity are appropriate, they will come out and move. So I know why snails are afraid of salt, It's the best of both worlds to know other knowledge about snails
The mystery of science is endless, let's explore it together!