How is it that you can scratch a CD-ROM and yet it still plays without error? Chalk it up to Claude Shannon's information theory. You can read Warren Weaver's easy-to-understand introduction to Claude Shannon's 1949 classic, "The Mathematical Theory of Communication" (you'll find excerpts at darkwing.uoregon.edu/~felsing/virtual_asia/info.html).
If your major is mathematics or computer science, you might be interested in Web sites that provide technical background about information theory. Using any search engine to look for "Claude Shannon" or "information theory," you should find a good selection of interesting Web sites, such as David J. C. MacKay 's online course at 131.111.48.24/pub/mackay/info-theory/course.html. Visit www.wfu.edu/Academic-departments/ Speech-Communication/infot/infop1.html, then link to the diagram for a visual approach to information theory.
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