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AC-DC AC/DC: What's the Difference?
Your computer plugs in to an AC outlet, and yet its guts relies mainly on direct current (DC). What exactly is the difference between the two types of current? This feature shows you.



Edison Recordings
The Edison company produced thousands of recordings between the years 1888 and 1929. Here are six blues and jazz songs, available in RealAudio and downloadable MP3 files.


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