Recent studies show that young children can be exposed to pesticides during normal oral exploration of their environment and their level of dermal contact with floors and other surfaces. Children living in agricultural areas may be exposed to higher pesticide levels than other children because of pesticides tracked into their homes by household members, by pesticide drift, by breast milk from t...

We report solar cells based on highly confined nanocrystals of the ternary compound PbSxSe1-x. Crystalline, monodisperse alloyed nanocrystals are obtained using a one-pot, hot injection reaction. Rutherford back scattering and energy-filtered transmission electron microscopy suggest that the S and Se anions are uniformly distributed in the alloy nanoparticles. Photovoltaic devices made using te...

T he (S, s) model represents in ideal form the interplay between economic theory and the world of application. It was created during a period in which microeconomic theorists and applied mathematicians forged many of the tools that dominate economic analysis to this day, including linear programming, dynamic programming, and game theory. These conceptual advances resulted in large part from the...