I have my own theory about why decline happens at companies like IBM or Microsoft. The company does a great job, innovates and becomes a monopoly or close to it in some field, and then the quality of the product becomes less important. The company starts valuing the great salesmen, because they’re the ones who can move the needle on revenues, not the product engineers and designers. So the salespeople end up running the company.

The Mona Lisa, to me, is the greatest emotional painting ever done. The way the smile flickers makes it a work of both art and science, because Leonardo understood optics, and the muscles of the lips, and how light strikes the eye - all of it goes into making the Mona Lisa's smile so mysterious and elusive.

Leonardo da Vinci was lucky to be born the same year that Johannes Gutenberg opened his printing shop. As a young person, he could get information about whatever struck his curiosity. The Internet is to our age what Gutenberg's press was to his, so he would have loved being alive today.

Otherwise, as Dylan says, if you're not busy being born, you're busy dying.

...never let a passion for the perfect take precedence over pragmatism.

Was he smart? No, not exceptionally. Instead, he was a genius.

It seems perverse to focus too much on the casualties or hardship in Afghanistan ...[Showing the misery of Afghanistan ran the risk of] promoting enemy propaganda...we must talk about how the Taliban are using civilian shields and how the Taliban have harboured the terrorists responsible for killing close up to 5,000 innocent people.