We review the relationship between polygyny and HIV and identify a positive individual-level correlation, and a negative ecological correlation. We subsequently examine two mechanisms that contribute to the individual-level correlation. First, we find that men in polygynous marriages have more extramarital sex than men in monogamous unions (both in terms of self reports and in terms of spousal ...

where the variables α and β range over entities of some sort, and where ∼ is an equivalence relation on this sort of entity. Frege’s inconsistent Basic Law V shows that not every such principle is acceptable. A variety of criteria for acceptable abstraction have been proposed.1 In this note I analyze the logical relations between some of the proposed criteria, in particular conservativeness, ir...

The exposition of this topic continues with a reprise of early theoretical considerations of biofeedback, the meaning and value of theta brain rhythms in human thought, creativity, and "trans personal psychology." This selection makes clear the foct that the Greens saw self-regulation by means of biofeedback not so much as an end in itself as a gateway to approaching personal development ofa mu...

www.sciencemag.org SCIENCE VOL 326 13 NOVEMBER 2009 909 COVER The Interstellar Boundary Explorer (IBEX) spacecraft has returned the first global images of the interaction of our heliosphere with the local interstellar medium. IBEX observations show a ribbon of energetic neutral atoms (reds to greens), snaking between the positions of the two Voyager spacecraft (white dots). This ribbon marks th...

Using our recently developed Chebyshev expansion technique for finite-temperature dynamical correlation functions we numerically study the AC conductivity σ(ω) of the Anderson model on large cubic clusters of up to 100 sites. Extending previous results we focus on the role of the boundary conditions and check the consistency of the DC limit, ω → 0, by comparing with direct conductance calculati...

Four different colors are needed to make maps that avoid adjacent countries of the same color. Because the retinal image is two dimensional, like a map, four dimensions of chromatic experience would also be needed to optimally distinguish regions returning spectrally different light to the eye. We therefore suggest that the organization of human color vision according to four-color classes (red...

In this work the Feynman-Schwinger representation for the two-body Greens function is studied. After having given a brief introduction to the formalism, we report on the first calculations based on this formalism. In order to demonstrate the validity of the method, we consider the static case where the mass of one of the particles becomes very large. We show that the heavy particle follows a cl...

Demand for Asian vegetables is rising rapidly due to changing demographics and increasing consumer awareness of their health benefits. However, growers are not familiar with growing these “foreign” crops insufficient technical information regarding suitable cultivars different regions, production schedules, disease pest susceptibility, postharvest management. The objective this study was conduc...