By model I mean model explaining the origins of agriculture, and you can read all about this hot number right here at ABW. And while you are working on that mind boggling concept, consider the role of r-strategists in your garden. Science in action.
Almost diamonds explains how it is al connected. Pay attention: Monetarism and the Housing Bubble
John Wilkins has the updated A List for Basic Science Concepts.
Are you poor? Are you a woman? Are you fertile? How would you like a cash payment to fix that? Maybe you can make that happen if you take a bus down to Loo-zi-anna where such a thing may be funded by the state. This is actually a fairly touchy subject. Razib’s take on it is here.