You do not question an author who appears on the title page as "T.V.N. Persaud, M.D., Ph.D., D.Sc., F.R.C.Path. (Lond.), F.F.Path. (R.C.P.I.), F.A.C.O.G.

The writing is always the easy part, provided I can get the good material. It's the getting of the good material that's a challenge.

I am very much out of my element here. There are moments, listening to the conversations going on around me, when I feel I am going to lose my mind. Earlier today, I heard someone say the words, "I felt at one with the divine source of creation." Mary Roach on a conducted tour of Hades. I had to fight the urge to push back my chair and start screaming: STAND BACK! ALL OF YOU! I'VE GOT AN ARTHUR FINDLAY BOX CUTTER! Instead, I quietly excused myself and went to the bar, to commune with spirits I know how to relate to.

I very much was inspired by Bill Bryson. He does cover science, but more often, it's a mixture of science and travel, and whatever he happens to be writing about - Shakespeare, Australia, the United Kingdom, or when he covers science in 'A Short History Of Nearly Everything' - he has an incredible ability to be both entertaining and enlightening.

Normally I object to strangers beaming force fields into my brain.

The point is that no matter what you choose to do with your body when you die, it won't, ultimately, be very appealing. If you are inclined to donate yourself to science, you should not let images of dissection or dismemberment put you off. They are no more or less gruesome, in my opinion, than ordinary decay or the sewing shut of your jaws via your nostrils for a funeral viewing.

In 'Packing for Mars,' I tried to convey the importance of getting young people interested in science.