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Radio is the transmission of signals by modulation of electromagnetic waves with frequencies below those of visible light.[1] Electromagnetic radiation travels by means of oscillating electromagnetic fields that pass through the air and the vacuum of space. Information is carried by systematically changing (modulating) some property of the radiated waves, such as amplitude, frequency, phase, or pulse width. When radio waves pass an electrical conductor, the oscillating fields induce an alternating current in the conductor. This can be detected and transformed into sound or other signals that carry information.

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review by . February 20, 2011
Old but a seductress nonetheless!
The radio is one of the few gadgets that seems to be everlasting. It is in fact one that had outlived the Walkman, the CD player, MD player, LD player and even the DVD player. It is one of the oldest gadgets that is still living in many households in the world. Sometimes, it may not be a set by itself but nonetheless, it's on your cellphone, car or stereo set.      A radio is a good source of news, music and also gossips! I've fond memories of the radio, even as I now …
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