An interesting discourse on the emerging principles of complex behaviors in systems and how they can emerge from a very small set of rules, if you have the right rules, enough agents following them, and enough interactions going on to break out of order but not quite fall into chaos.
This excerpt is from The New Scientist on-line journal. (http://www.newscientist.com/opinion/opinterview.jsp?id=ns230516)
 

                                                                                          Principia Mathematica III
 

 

                                                                                          He was a child prodigy, publishing his first
                                                                                          paper at 15. Now Stephen Wolfram says he
                                                                                          has created a new kind of science based on
                                                                                          simple computer programs rather than
                                                                                          equations. It's a bold claim, but it has taken
                                                                                          him 20 years--ten of them thinking and
                                                                                          working late into the night, and publishing
                                                                                          nothing. By a nice irony, that intellectual
                                                                                          space was bought by the millions he made
                                                                                          out of Mathematica, a computer program
                                                                                          that makes complicated mathematics
                                                                                          doable for ordinary mortals. Now, at 41,
                                                                                          he's busy gearing himself up for the glare of
                                                                                          publicity as he prepares to publish the fruit
                                                                                          of all those years. Marcus Chown caught up
                                                                                          with Wolfram--at 3 am