There is nothing more mysterious than a TV set left on in an empty room. It is even stranger than a man talking to himself or a woman standing dreaming at her stove. It is as if another planet is communicating with you.

The PC has improved the world in just about every area you can think of. Amazing developments in communications, collaboration and efficiencies. New kinds of entertainment and social media. Access to information and the ability to give a voice people who would never have been heard.

The manual for WordStar, the most popular word-processing program, is 400 pages thick. To write a novel, you have to read a novel - one that reads like a mystery to most people. They're not going to learn slash q-z any more than they're going to learn Morse code. That is what Macintosh is all about.

I love working out how things are made, which is why I have so many models of towers.

Give a girl the right shoes, and she can conquer the world.