As soon as I finished it, I turned back to page one and read it straight through again—the only time I have ever done that, and I wrote to tell him so. He replied that he was a fan of my books, and he invited me to his house in London. I have seldom met a more congenial spirit. Obviously I knew he would be funny. What I didn’t know was how deeply read he was in science. I should have guessed, for you can’t understand many of the jokes in Hitchhiker if you don’t know a lot of advanced science. And in modern electronic technology he was a real expert. We talked science a lot, in private, and even in public at literary festivals and on the wireless or television. And he became my guru on all technical problems. Rather than struggle with some ill-written and incomprehensible manual in Pacific Rim English, I would fire off an e-mail to Douglas. He would reply, often within minutes, whether in London or Santa Barbara, or some hotel room anywhere in the world. Unlike most staff of professional helplines, Douglas understood exactly my problem, knew exactly why it was troubling me, and always had the solution ready, lucidly and amusingly explained. Our frequent e-mail exchanges brimmed with literary and scientific jokes and affectionately sardonic little asides. His technophilia shone through, but so did his rich sense of the absurd. The whole world was one big Monty Python sketch, and the follies of humanity were as comic in the world’s silicon valleys as anywhere else.

He laughed at himself with equal good humour. At, for example, his epic bouts of writer’s block (“I love deadlines. I love the whooshing noise they make as they go by”) when, according to legend, his publisher and book agent would lock him in a hotel room, with no telephone and nothing to do but write, releasing him only for supervised walks. If his enthusiasm ran away with him and he advanced a biological theory too eccentric for my professional scepticism to let pass, his mien at my dismissal of it would always be more humorously self-mocking than genuinely crestfallen. And he would have another go.