Many people have told me that once they learn of Madam Walker's accomplishments they are surprised, even embarrassed, that they have never heard of her. But they shouldn't be. Her extraordinary story was simply omitted from the history books.

Now, occultism is not like mystic faculty, and it very seldom works in harmony either with business aptitude in the things of ordinary life or with a knowledge of the canons of evidence in its own sphere.

It's populated by people who, by and large, have terrific communication skills. Every day is an extraordinary day. For me, it was just a great area for storytelling.

With 'The Social Network,' I got into it at first because frankly I thought there was a cool courtroom drama to be had with the intellectual properties. And then what further drew me in was that the most extraordinary social networking device ever created was created by the world's most antisocial person. I liked that story.

My story is similar to every ordinary Indian boy's tale. My father wanted me to become an engineer or a professional but I was sure that I have to be in the Hindi film industry. I joined college through the quota for extra curricular activities but I am still not a graduate.

Those who incline to very strictly utilitarian views may perhaps feel that the peculiar powers of the Analytical Engine bear upon questions of abstract and speculative science rather than upon those involving everyday and ordinary human interests.

There are two - parallel - universes of science. One is the actual day-to-day work of scientists, patiently researching into all parts of the world and sometimes making amazing discoveries. The other is the role science plays in the public imagination - the powerful effect it has in shaping how millions of ordinary people see the world.

Fred Hoyle was one of the first scientists to become famous on television and radio. It was because he told a dramatic story about the universe - about how amazing it is and the extraordinary discoveries that astronomers like him were making.

I've been going to the same barber the last few years, and we have great chats whenever I'm in the chair. He'll ask: 'How you doing? How's the training going?' Just ordinary, obvious things, but then, like you do with your barber, you start talking about personal stuff.