 Maybe we could come on to this in a minute because it's a sort of topic in its own right in a way. But in the course of my job at Jane's, I decided to write The Hunt to Zero Point, which was my sort of investigation of anti-gravity. And that did emerge out of the work that I was doing at Jane's, but I did it on my own. If you like, it was a sort of sub-radar activity for me that I didn't know it was going to morph into a book.