Personal Electronic Media Players

For many, personal audio electronic devices such as iPods and other MP3 Players play a pivotal role in our individual entertainment lives. Many of us couldn’t imagine a walk to work or treadmill jog without one.

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Do certain radio wave frequencies pose health risks? If so, is it safe to live within a quarter mile of a cellular phone tower or a radio antenna?

EPIRB is meant to help rescuers locate you in an emergency situation, and these radios have saved many lives since their creation in the 1970s. Find out who they've helped the most.

Have you ever noticed a difference in the quality of radio signals depending on the time of day? Why do you hear some radio stations better at night than in the day?

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The air around you is bursting with radio waves -- and you can tap into them with minimal effort. With a simple radio scanner, all sorts of transmissions are within your earshot. Find out how radio scanners let you listen in on everything from police to astronaut transmissions.

By Gary Brown

AM radio, FM radio, CB radio, short wave radio, VHF, UHF -- what's it all mean? These are all different chunks of the radio spectrum. Find out all about the thousands of different uses for radio waves.

By Marshall Brain

Ham radio lets people talk across the globe, wirelessly and inexpensively. It's a subculture in its own right. See what amateur radio is all about and how you can become an operator.

By Gary Brown