There's a limit to how much you can deploy renewables, like wind or solar. People will talk about getting up to 30 percent of America's power from renewables, but you can't get to 100 percent because of their unreliability.

If people don't find what you are doing threatening, then it is probably not very important.

The techniques of being an Internet visionary are just like those of lower-tech fortunetellers through the ages. A technological visionary must tell people what they want to hear, because your company's stock won't rise if you spout an unpopular vision to analysts.

If you want to do interesting software, you have to have a bunch of people do it, because the amount of software that one person can do isn't that interesting.

Many of the things the slow food people honor were innovations within historical times. Somebody had to be the first European to eat a tomato.