Wolfram Alpha (http://www.wolframalpha.com) is a computational knowledge engine. It generates output by doing computations from its own internal knowledge base, instead of searching the web and returning links. Check it out! It is great for math but also a wide range of other subjects.
http://www.wolframalpha.com/screencast/introducingwolframalpha.html
Have you used Wolfram Alpha in your class (face-to-face or online)? Let us know!
-LT
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