Question of the Day!

So, I am one of the fill-in questioners; let's get this!

2 things - one, I have no idea how to make it look purty, and two, I am Australian, so I spell and punctuate differently.

As such: my question:

If you could write a non-fiction book about any topic, which one would you choose? If you have done so, which one did you choose? And, for both, why?

This is not necessarily about your interests, but something you think you could deliver a good book on.

Me? Well, I am almost finished (I hope) my monster dictionary. Why? Because I wanted a book with everything in one place, and so I needed to write it myself. That and I am really interested in mythology.