We are strangely biased, as individuals and media institutions, to focus on big sudden changes, whether good or bad - amazing breakthroughs, such as a new gadget that gets released, or catastrophic failures, like a plane crash.

Popular culture, on average, has been growing more cognitively challenging over the past thirty years, not less. Despite everything you hear about declining standards and dumbing-down, you have to do more intellectual work to make sense of today's television or games - much less the internet - than you did a few decades ago.

The problem is, there are definitely some genuinely lame things on television, and there's more at the bottom of the barrel, because the barrel in a sense has gotten bigger.

It is extraordinary how safe flying has become. You are now statistically more likely to be elected president of the United States in your lifetime than you are to die in a plane crash. What an amazing achievement as a society! But what we end up focusing on are the catastrophic failures that are incredibly rare but happen every now and then.

I love those stretches where I've just been a writer - when I haven't been doing Internet start-ups - where I pretty much eliminate meetings from my life.

If you look at where innovation - defined as ideas, not as commercial product - tends to live, the university system is remarkably innovative.

This is how great intellectual breakthroughs usually happen in practice. It is rarely the isolated genius having a eureka moment alone in the lab. Nor is it merely a question of building on precedent, of standing on the shoulders of giants, in Newton's famous phrase. Great breakthroughs are closer to what happens in a flood plain: a dozen separate tributaries converge, and the rising waters lift the genius high enough that he or she can see around the conceptual obstructions of the age.