http://www.wolframalpha.com/
I really don't know how to explain it... the site says:
Making the world's knowledge computable
Today's Wolfram|Alpha is the first step in an ambitious, long-term project to make all systematic knowledge immediately computable by anyone. You enter your question or calculation, and Wolfram|Alpha uses its built-in algorithms and growing collection of data to compute the answer.
...
(http://i148.photobucket.com/albums/s4/Da_Davermen/wolfram03.gif)
It has no knowledge of pop culture, so most people seem to think it's broken.
true.
It just told me that I'm seven thousand five hundred and six days old.
That's pretty cool, I guess.
Big deal, I'm approximately 741,100,000 seconds old - beat that! :P
I can't, you're 95,900,000 seconds older than me.
At least it knows this:
http://www42.wolframalpha.com/input/?i=life%2C+the+universe%2C+and+everything
Haha, that's awesome. It's also good at this one:
http://www42.wolframalpha.com/input/?i=What+is+the+air+speed+velocity+of+an+unladen+swallow%3F (http://www42.wolframalpha.com/input/?i=What+is+the+air+speed+velocity+of+an+unladen+swallow%3F)
That's fun. I like this thing.
HERE (http://www51.wolframalpha.com/input/?i=how+much+wood+would+a+woodchuck+chuck+if+a+woodchuck+could+chuck+wood)
It's nice, but it doesn't have many answers to my special questions. :-\