By burning nuclear waste as fuel, we believe we can power the United States cleanly for hundreds of years without ever touching new resources.

Suppose that 'Unsolved Mysteries' called you with news of a long-lost identical twin. Would that suddenly make you less of a person, less of an individual? It is hard to see how. So, why would a clone be different? Your clone would be raised in a different era by different people - like the lost identical twin, only younger than you.

Another random thing I do is the search for extraterrestrial intelligence, or SETI. And you may be familiar with the movie 'Contact,' which sort of popularized that. It turns out there are real people who go out and search for extraterrestrials in a very scientific way.

One of the ugly secrets of the renewable-energy industry is that its products make no economic sense unless they are highly subsidized.

Now, to find dinosaurs, you hike around in horrible conditions looking for a dinosaur. It sounds really dumb, but that's what it is. It's horrible conditions, because wherever you have nice weather, plants grow, and you don't get any erosion, and you don't see any dinosaurs.

I was good at math and science, and I got lots of degrees in lots of things, but in a parallel universe, I probably became a chef.

Among modern occupations, only cult leaders and TV weathermen rival the technological visionary's ability to retain credibility despite all evidence to the contrary.