The WolframAlpha search engine

A friend of mine asked me if I knew anything about this new search
engine, which I've just had a look at via Google.

It is truly amazing.

It's a "computational-knowledge" search engine, and it's free to use.
You don't have to download anything (or register online with it).

Here is a link to an online demo, given by Stephen Wolfram.

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

(It takes 1-2 minutes to load up)

Here is a link to the website itself.

http://www.wolframalpha.com/

So I invite you to have a go at using it, after watching the video ...
perhaps you'd like to find out what happened on your birthday, or
check what the weather was like on that day?

It would have been brilliant to have had this website to help me
(and my dad) do my school Maths homework ... would have saved us many
hours of work. :)