almost every person in the world has a computer. It is a very useful invention.especially the computer is indispensable in studies.in the Internet you can find a lot of useful information.for example, is there life on Mars or how many teeth have sharks.. Also it is very convenient to communicate with people who are far away from you. An email reaches to the recipient faster than a paper letter. Also, you can talk to your friends and family on Skype, to not only hear them but also see. the computer has many advantages, but do not forget that it may harm the eyes
Radio - RAM media
Radio does not stop to do other things,
A large audience;
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The short sound advertising radio spot,
The background,
A highly competitive radio and low prices.