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.

Silicon-based life may be impossible for one other reason: silicon bonds readily dissolve in water.

Most new movements start this way: hundreds or thousands of individuals and groups, working in different fields and different locations, start thinking about change using a common language, without necessarily recognizing those shared values. You just start following your own vector, propelled along by people in your immediate vicinity. And then one day, you look up and realize that all those individual trajectories have turned into a wave.

This is not the wisdom of the crowd, but the wisdom of someone in the crowd. It’s not that the network itself is smart; it’s that the individuals get smarter because they’re connected to the network.

The economics of television syndication and DVD sales mean that there's a tremendous financial pressure to make programs that can be watched multiple times, revealing new nuances and shadings on the third viewing. Meanwhile, the Web has created a forum for annotation and commentary that allows more complicated shows to prosper, thanks to the fan sites where each episode of shows like 'Lost' or 'Alias' is dissected with an intensity usually reserved for Talmud scholars.

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

In a peer network, no one is officially in charge. It doesn't have a command hierarchy. It doesn't have a boss. So, all the decisions are somehow made collectively. The control of the system is in the hands of everyone who is a part of it.