If we could convert 0.03 percent of the sunlight that falls on the earth into energy, we could meet all of our projected needs for 2030.

Our intuition about the future is linear. But the reality of information technology is exponential, and that makes a profound difference. If I take 30 steps linearly, I get to 30. If I take 30 steps exponentially, I get to a billion.

Doing real world projects is, I think, the best way to learn and also to engage the world and find out what the world is all about.

Supercomputers will achieve one human brain capacity by 2010, and personal computers will do so by about 2020.

By 2009, computers will disappear. Displays will be written directly onto our retinas by devices in our eyeglasses and contact lenses.

It is doubling now every two years. Doubling every two years means multiplying by 1,000 in 20 years. At that rate we'll meet 100 percent of our energy needs in 20 years.

I do have to pick my priorities. Nobody can do everything.