Computers are very important in our 21th century civilisation. Do we really need them?

Computers are very useful for keeping on storage a very large amount of information. People use computers almost in every field. They prove a high inportance in the sphere of sciences, like mathematics, phisics, chemistry, biology. In medicine with its help deseases can be discovered and cured.
Personal computers are useful in projecting buildings more punctually and extremely faster too. It's an extremely big help on orientating the airplanes and ships.
They are used to detect the weather's changing, geological observings.
Today's computer stays in permanent connection with...