What is the greatest invention in the last century

What is the greatest invention in the last century

We knew there had been many inventions at the last century, for

example, electric light bulb, telephone, phonograph, mimeograph machine,

automobile, airplane, atomic weapon, computer and so on. Wha

t’s the greatest

invention in the last century?

Personally, I think the greatest invention should be computer.

Human being have been in possession of brightness since electric lamp

was invented. With invention of the telephone in 1876, the people who live in

eastern hemisphere and in the western hemisphere seemed nearer and

nearer to live. But, with the occurrence of atomic weapon, there are many

performances of tragedy, the disaster have even stayed to the

contemporaries.

In the old days, many scientists took much time to calculate and deal with

research data, so the effective time in doing research was relatively shortened.

For millions of times of calculating per second by computer, the researchers

may have enough time to study more important issues. The processing of

experiment results became very simple and easy. Aren’t those all evidences

that the computer is one of the greatest inventions in the last century, are

those?

In one word, that the greatest invention is computer is not paint the devil

blacker than it is.

As far as I am concerned, the computer is the greatest invention so farhine.

The oldest kind of computer is the abacus, used in China many centuries ago,

but the first large and modern computer was invented in 1946. The computer

could work out maths problems quite fast.

Now the computers are getting smaller and smaller, and computing faster and

faster. Many scientists agree that computers can now do many things, but they

cannot do everything. Who knows what the computers tomorrow will be like?

Will computers bring good things or bad things to people? The scientists today

have to decide how to use the computers tomorrow.

So computers do considerably good to our life.

The greatest invention in my eyes

Good morning, ladies and gentlemen, thank you for your patience.

These days I asked many friends about the greatest invention, and they gave

me many answers, such as telephone, paper, computer and so on. Absolutely ,

all the inventions they told me are great, but in my eyes, it

’s a little hard to

approve, so finally I chose my own one.

I must confess that I am speaking here with great panic and excitement,

because the greatest invention in my eyes is football.

THE explosive eruption of Eyjafjallajokull, an Icelandic volcano, wreaked

havoc on air travel over the North Atlantic for several weeks this spring. The

very existence of the ash cloud thrown into the sky was bad enough. But an

inability to predict the cloud’s behaviour made matters worse. In particular,

sudden changes in its height made the job of flying safely above it a tricky one.

Now a team of researchers at the British and Icelandic Meteorological Offices,

led by Alec Bennett, may have found a way round the problem of predicting the

height of volcanic ash clouds like that created by Eyjafjallajokull. As they report

in Environmental Research Letters, the lightning the ash generates tells all.

Volcanic-ash clouds contain a lot of static electricity. This is eventually

discharged as bolts of lightning. The details, however, are obscure, so Dr

Bennett and his colleagues decided to take advantage of ATDnet, a British

long-range lightning-location network, to look at the phenomenon in more

detail.

ATDnet is an arrangement of 11 sensors scattered across Eurasia, one of

which is in Iceland. It is designed to detect the low-frequency radio pulses

emitted by lightning strikes. Such pulses can travel thousands of kilometres,

which means they are frequently picked up by more than one of ATDnet’s

sensors. When that happens, triangulation allows the system to locate the

original bolt with precision. Using ATDnet, Dr Bennett and his colleagues were

able to identify 790 bolts which had descended from the ash cloud created by

Eyjafjallajokull. They combined these findings with radar information on the

height of the cloud to work out if there was any connection between the two.

There was. When the cloud’s maximum altitude was less than 5km (3 miles),

ATDnet detected no lightning from it. The number of strikes went up as the

maximum altitude increased. Sudden changes in altitude also pushed the

strike-rate up. More than 20 bolts an hour indicated a rapid rise of more than

1km.

In the case of Eyjafjallajokull, the watchful eye of Icelandic radar meant the

cloud’s behaviour was reasonably we

ll understood, even at the time. But radar

can be blinded by bad weather, and not all volcanoes are within range of

suitable equipment. Next time a volcano threatens the air lanes, then, Dr

Bennett’s method may provide valuable illumination of what is happ

ening, and

thus enable airliners to steer safely through what might otherwise ground

them.

The Greatest Invention

Some articles hold the opinions that the greatest invention in the world is electricity,while the others

believe computers are unreplaced in modern society.I read and read,suddenly an idea struke me:The

greatest invention are just books.

A famous person has ever said:

the long history of human being,books have playde an important part in communicating

even today,the situation is still so .Each year,millions of books are published in the

dge changs our a knowledged person want to express some new idea,probably he

wiil choose to write a the other hand,the best way to broaden our horizens is reading books.

Secondly,as I have been puzzled,books provedes you with different you make your decision to

choose anyone that fit otherwise,you may choose none of them,just like me ,instead of obeying

books' advise.I choose

interesting?Books are honored as teachers without how are books different from our real

teachers?I think the fact is that,if a real teacher advises me to choose electricity or computer as my topic

today,and every one you can imagine,how much brave I will prepare to don't you think books

are better tempered and better get alongde than our real teachers?

The four great inventions

Paper: paper is an important chemical processes, the invention of paper is

Chinese in the spread of human culture and development make a valuable

contribution, is China's chemical history of a major achievement.

The paper also before, oracle bones, bamboo slips and silk silk is used for

writing, the ancient recorded material. But due to the rapid development of the

economy, culture, bones and bamboo can not meet the demand of

development, thus contributing to the improvement of writing tools. At that time

people began using small silk made of paper, as the ancient Chinese when

paper by hemp thread and silk, and preparation method of rough paper, so the

quality is not so good. But the hemp thread and silk has its own role, to use

them as a raw material for paper- making, would be greatly restricted, and

difficult to get rapid development, to meet the cultural life of the requirement to

paper.

In the new situation request, Cai Lun of Eastern Han Dynasty for the

emergence of papermaking to bring new breakthrough in the Eastern Han

Dynasty,

vacation, closed to the guest, aeration body field. Code for the sale, made with

bark and spacious cloth, net to make paper. Xing Yuan first year playing, the

emperor can, since is not used, the salty called Cai Hou paper

Cai Lun is using bark, rags, net of papermaking. Although before Cai Lun also

has a paper, but raw material itself is very limited, and Cai Lun on the new raw

materials, to solve this problem. Because the rag, broken fishnet had already

finished their task, a waste and used as a raw material for papermaking

industry, which plays an important role.

Printing: is the working people in ancient China through long-term practice and

research before the invention of. About the year before and after 600 years of

Sui Dynasty, people from the engraved seal inspired, in the history of

mankind's earliest invention of woodblock printing.

Woodblock printing is in a certain thickness of the smooth wood, paste copy

neat manuscript, thin and almost transparent paper front and wood paste, the

word became the body, strokes clear. Engraving workers graver in the suites

have writing section is cut away, is a convex embossed font, and font recessed

beneath the different steles. When printing, on a raised fonts with ink, and then

the paper covering on top of it, gently wipe away the paper back, writing

remain on the paper. By the Song Dynasty, woodblock printing career

development to the heyday. Woodblock printing on the spread of culture play

an important role, but also has obvious disadvantages. The first version,

time- consuming material costs, second, a large number of books stored

inconveniently, third, is not easy to correct mistakes.

The Northern Song Dynasty civilian inventor Bi Sheng invented movable-type

printing, woodblock printing these drawbacks improvement. Bi Sheng's

Dynasty of an ordinary civilian intellectuals, the person who. He summed up

the block printing of rich experience in practice, after repeated tests, the

emperor Renzong of evolution years (AD 10411048 ) made the moveable,

execute typesetting printing, completed the printing history of a major

revolution, about 200 years later, this technology spread to other countries, the

development of world civilization process to promote the role of.

Gunpowder: is one of the four great inventions of china. Gunpowder, as the

name suggests is the ( fire medicine ). Its origins and alchemy are closely

related, Bachelor in ancient alchemy alchemy inadvertently material.

It is a mixture of saltpeter, sulfur, carbon, and the top two in the Han Dynasty

book into Chinese Materia Medica ( first classics of Shennong materia medica

by ) have been listed as important medicinal herbs. Gunpowder itself is also

come under the drug class, the Ming Dynasty Li Shizhen ( compendium of

Materia Medica ) said, gunpowder can cure sore ringworm, insecticidal,

provide moisture and plague. The invention of gunpowder is a long-term

alchemy pharmaceutical practice results, has been one thousand years of

history.