The invention of the pen

In 1938, hungarian inventor, Lazlo Biro, invented the pen. He used the pen that had a small ball with viscuous and oily red ink. He went to Argentina in 1940, escaping from the nazis. He patented his invention the 10 of June of 1943 and inmediately people started to use it in Buenos Aires.

He had this fantastic idea while he was looking at some boys that were playing in the street with small balls.

the enviroment and the pollution

First of all, I think that the principal responsible of the pollution are the human being, because we don't look after much the enviroment. somebody arent very tidy, some people take out the rubish at the incorrect time, other people drop litter on the streets and anyboddy pick it up.
Secondly, sometimes the people waste the water, and the water in the word is very important, because all of us need it.
Also, a lot of oil are found on the sea for year, and fortunately some people clean it up.
Perhaps, we can help, can't we?
Finally, other of thigs that pollute the atmosphere are the factory fumes.
To sum up, I say that we help for our city will be better than now. for example, we can recycling the rubbish, we don't waste water and no pollute our city.

Our city (by Anita, 2d)

First of all, I think that our town is full of environmental. All of us pollute a bit the environment, and every day it is getting from bad.
But I think that we can solve it. These are my ideas: We shouldn´t waste the water, for example: if we wash our teeth, at that moment we should close. Don´t drop litter, we can drop it in the rubbish bin. If we see litter in our house, we should pick it up. Recycling some rubbish is a good idea. Don´t cut down trees, or if we cut down one tree, we´ll plant two trees.
Also, I think that factories and cars fumes is a big problem and I don´t know what do to change it for better. Only that we can use bicycles or walk for short journeys, and then pollution will decrease.
Finally, I´m sure that we will make our city better, but all of us have to help.

My invention (by Fabi, 2d)

I'm writing about the battery.
The man who invented it was Lewis Urry, from Canada.
He got the idea when the Carbide Union asked him for the creation of a vttery with a longer duration. He experimented with some materials and he discovered that the zine had a longer duration than the common batteries. They were on sell in 1959.
Personally, I think that this invention is very useful if you use a lot of batteries.

Alexander Graham Bell and his invention: the telephone

The visionary man who invented the telephone, was Alexander Graham Bell . This built the first telephone in 1876, in the state of Massachusetts in the United States. This useful invention, consists of the transmission of sounds from a distance using electricity. Thus, as in 1876, develops the phone, with financial support from their in-laws. The system used is basically that we continue using. The transformation of sound, electrical impulses. That same year, Bell patented his invention. But the United States Congress, by performing an act of justice, officially recognized the contribution to the development of telephone made by Antonio Meucci. Meucci was Italian, who was born in 1808 in Florence. After various problems in their lives, with the Italian government at the time, moved to the United States. Meucci, would have invented a basic form of telephone, in 1854. Her need was quite simple. Joining in a direct manner, his office to the second floor, where her room was. This, because his wife suffered from rheumatism, so that he could not get off easily, the stairs of the house. Thus, she could easily communicate with her husband, against any need to be submitted.
Regardless of these technicalities, now almost universally recognized that whoever was Bell invented the telephone.

the invetion of cell phone (by Julieta Kaplan)

By 1973, Martin Cooper invented the first cell phone. at the beginning were very large and expensive, and were only used by the military and some businesses. For 1983 were smaller and economic and could be used by the general public. The revolution of the cell was in 2001 when it began to appear phones with color display. and in 2006, when cellular appeared with cameras. at present has become an object used by all people.

The invention of the mobile phone

In 1973 Marin Cooper invented the mobile phone. He was working for Motorola Company.
It was big and expensive and used by the military force, then it was smaller and a lot more economical.
It was called Dynatac 800 x and it was 750 gr.
In 1983 it was on sale