WolframAlpha

tutorial of a quick way to get your homework answers. 
where was this when i was in calculus?

http://www.wolframalpha.com/screencast/introducingwolframalpha.html

It's genious, and it really works!

i wish it had a blog widget,
I'd put it on my side bar with all of the other stuff I should weed through.

have you heard of it?  my dad sent me the link.