Stephen Wolfram: Computing a theory of everything - TedTalk

This TedTalk is worth the 20 minutes (wow).
http://www.ted.com/talks/stephen_wolfram_computing_a_theory_of_everything.html

WolframAlpha Site (after you ask it a question, See the examples in the right nav – of what to type into the “search”)
http://www.wolframalpha.com

WolframAlpha Blog – How students use the tool at College
http://blog.wolframalpha.com

Calculus & Analysis
http://www.wolframalpha.com/examples/Calculus.html