The idea behind a dish - the delight and the surprise - makes a difference. Great literature surprises and delights, and provokes us. It isn't just 'Here's the facts - boy meets girl, boy loses girl, boy gets girl.' It's how you tell it.

The reason societies with democratic governments are better places to live in than their alternatives isn't because of some goodness intrinsic to democracy, but because its hopeless inefficiency helps blunt the basic potential for evil.

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.

One of the things that I love to do is travel around the world and look at archaeological sites. Because archaeology gives us an opportunity to study past civilizations, and see where they succeeded and where they failed. Use science to, you know, work backwards and say, 'Well, really, what were they thinking?'

New online formats gutted the newspaper-ad business. Why pore over tiny print looking for a job in the want ads when you can tap a few keywords into monster.com, then click through and apply? Why pay a steep per-character rate for a classified when you can hawk a whole garage full of used stuff on EBay or Craigslist for free?

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.

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