Learning ballroom dancing is great for your brain. But it only works for three to six months. After that, you've got all the benefit you can get, and so you have to move on to yoga, and then Tai Chi, and then bridge, always keeping on the steep part of the learning curve.

Innovation is hard. It really is. Because most people don't get it. Remember, the automobile, the airplane, the telephone, these were all considered toys at their introduction because they had no constituency. They were too new.

Radical innovation is difficult to fund. It seems scary. And the really radical things seem even more scary.

Everybody believes in innovation until they see it. Then they think, 'Oh, no; that'll never work. It's too different.'