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What do you think has been the most important invention ever?

How could I answer this question? I think it is the most difficult question to solve, because, how can I choose between: electricity, which is the main way of using the energy in the world; genetic theory, in which are based new investigations to cure a lot of illnesses like cancer or diabetes; penicillin, with which millions of lives have been saved; and Gutenberg's printing press, which has taken the culture around the world.
However, if I have to choose one I think the most important invention is electricity because it is part of our life. We realize of this when there is a powercut and we can't watch television, we can't use the computer or any electrical appliance for example the microwave, washing machine or the dishwasher. We can do nothing if we don't have electricity.
On the one hand, we can't communicate with anybody because the telephone and internet don't work. And on the other hand we can't use the public transport. Things that nowadays we don't know how to live without them.
In conclusion, it seems to me that electricity is basic in our lives, but in addition as a result of this, new important inventions have been possible. So electricity has made the world into what we know today.

Advantages and disadvantages of technology and computing
The development of technology and communications during the last decade of the 20th century has had an important influence in our lives. It has revolutionised the way of working, learning and communicating. But what has changed our life the most is definitely the internet. However, there are advantages and disadvantages.
The main advantage of computing is probably that it gives access to the information quickly and easily. It also helps us to do tasks more efficiently. What is more, technology improves the lives of those who have less opportunities and access to education and it contributes to the development of poor or isolated regions in the world.
On theother hand, there are disadvantages. People have to learn new skills since the world of work has changed. As a result, people who can not use computers will not be able to get a job. Besides, we depend so much on computing that if the computer breaks down or there is not electricity we can not work at all.
In conclusion, I think the computer chip is probably the most useful invention of the 20th century, in spite of having to face some difficulties to adapt ourselves to new technologies.

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