Using selective maize yield data from ethnohistoric and government sources dating between the mid-nineteenth and mid-twentieth centuries, Schroeder (1999) argues that Mississippian average yield potential fell within a 9-10 bu/acre range. We evaluate her argument in terms of well-established climatic, environmental, varietal, and behavioral constraints on maize agriculture and conclude that reconstructing prehistoric agricultural potential requires a more precise methodology that incorporates these factors.

Healthcare costs in the U.S. are the highest in the world and are increasing rapidly. With increasing costs, employers and health insurance companies are trying to contain the cost of healthcare. This study aims at developing a predictive model relating enrollees' healthcare insurance claims to their health risks while controlling for gender, age, and their previous year's claims. Our study findings suggest that age, gender, and a previous year's healthcare expenditure are strong predictors of healthcare cost and that none of the six biomarkers was a significant predictor. Even though these biomarkers failed to contribute to the predictive model, they are, nonetheless, important predictors of future chronic diseases, many of which are leading causes of death in the U.S.

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