Leonardo da Vinci had such a playful curiosity. If you read his notebooks, you'll see he's curious about what the tongue of a woodpecker looks like, but also why the sky is blue, or how an emotion forms on somebody's lips. He understood the beauty of everything. I've admired Leonardo my whole life, both as a kid who loved engineering - he was one of the coolest engineers in history - and then as a college student, when I travelled to see his notebooks and paintings.

If you act like you can do something, then it will work.

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.

I am a fruitarian and I will only eat leaves picked by virgins in the moonlight - Steve Jobs

Most innovation comes from people working together, collaborating in teams.

He had the uncanny capacity to know exactly what your weak point is, know what will make you feel small, to make you cringe," Joanna Hoffman said. "It's a common trait in people who are charismatic and know how to manipulate people. Knowing that he can crush you makes you feel weakened and eager for his approval, so then he can elevate you and put you on a pedestal and own you.

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