Ed Woolard, his mentor on the Apple board, pressed Jobs for more than two years to drop the interim in front of his CEO title. Not only was Jobs refusing to commit himself, but he was baffling everyone by taking only $1 a year in pay and no stock options. I make 50 cents for showing up, he liked to joke, and the other 50 cents is based on performance.

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.

Pretend to be completely in control and people will assume that you are.

I think Leonardo da Vinci teaches us the value of both being focused on things that fascinate us but also, at times, being distracted and deciding to pursue some shiny new idea that you happen to stumble upon. Balancing intense focus with being interested in a whole lot of different things is something that we have to do in the Internet age.

Throughout his life, Albert Einstein would retain the intuition and the awe of a child. He never lost his sense of wonder at the magic of nature's phenomena-magnetic fields, gravity, inertia, acceleration, light beams-which grown-ups find so commonplace. He retained the ability to hold two thoughts in his mind simultaneously, to be puzzled when they conflicted, and to marvel when he could smell an underlying unity. "People like you and me never grow old," he wrote a friend later in life. "We never cease to stand like curious children before the great mystery into which we were born.

If you truly have a passion for what you do, you will care even about the parts unseen.

Polite and velvety leaders, who take care to avoid bruising others, are generally not as effective at forcing change.