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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We can transform musical sounds into numbers and record them digitally, although the files can be very large and take over your storage space. That's where the MP3 format comes in. Learn what MP3 files are and how they work.
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?
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