Hi Judah, Good stuff, But I dunno about this one. I'm not sure what it means that 'agriculture fits well with the organization of our brain'. I always thought it arose from laziness. Hunter/Gatherers would have learned where the mango trees grew and what time of year they would become ripe. Eventually they would establish a 'route' to take them from one natural 'orchard' to the next for their seasonal gathering forays ... probably camping in similar areas. Eventually one of the brighter of the lot would figure agriculture out -> "Damn I hate hiking around gathering freaking mangos. ... Gee ... Funny how there always seem to be a lot of new mango trees in the middens ... Hmmmmmmm" ;-) RonL. ('Ham', however, proved to be a much tougher concept to develop.) -----Original Message----- From: Judah McAuley [mailto:judah at wiredotter.com] A good example is agriculture. Agriculture has been incredibly successfull. Why? It has long been assumed that it is because people who had it were healthier, happier, and had more children. Research doesn't indicate that was the case. Hunter gatherer groups, especially early on, had a healthier, more balanced diet, they had more leisure time, and they were less susceptible to plague, drought, flooding, war, etc. So why did agriculture suceed? Because its an idea that fits well with the organization of our brain and people who accepted it lived close together which made it easier for more memes to propagate. It is alot easier for an idea to gain critical mass in a large, dense population than it is in a small, dispersed population.