This paper reviews and compares two air quality benefit assessments completed for California's South Coast Air Basin in 1989 and 2008. Specifically, we separate the influence of changes in population and air quality from that of newer health concentration-response relationships and changing...

We extend the scope of the often-asked question "who talks more-men or women?" by analyzing gender differences in talking via electronic communication. We do this by conducting a controlled experiment to elicit email communications and personal characteristics from a sample of college students....

Introducción. En la producción de cultivos se llama "cubrimiento" a la tela de plástico colocada a cierta altura del suelo de cultivo. Tal tela tiene varias ventajas. Mejora la estructura del suelo, ayuda a mantener una temperatura uniforme en el suelo, limita la pérdida de nutrientes del...