I think this is probably only for windows users but anyway, its a feature called speech, and its fun!
How to use it:
In start menu click control pannel.
On the left hand side of control pannel, stwitch to classic veiw, search for speech
Click the speech icon (It'l say speech under it anyway)
Type in what you want it to say and it will!
Its really cool and give it a go.
