Here is one of the most interesting and useful websites I have come across in a long time. Be careful, you may end up spending hours there.
Quoting from Wolfram|Alpha's site:
"Today's Wolfram|Alpha is the first step in an ambitious, long-term project to make all systematic knowledge immediately computable by anyone"
Mathematica has grown into an awesome product. This application of it is inspiring.
Enjoy.
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