I don't plan to write another science book, but I don't plan not to. I do enjoy writing histories, and taking subjects that are generally dull and trying to make them interesting.
Most scientists are without exception adorably quirky, and one of the ways of making it more accessible was to try to get readers interested in the person.
More than 300 million people in the world speak English and the rest, it sometimes seems, try to.
I don't want to go and start trying to make jokes in places like India, Tanzania or Iraq. Afghanistan is not a funny place.