Eliciting people's values is a central pursuit in many areas of the social sciences, including survey research, attitude research, economics, and behavior decision theory. These disciplines differ considerably in the core assumptions they make about the nature of the values that are available for elicitation. These assumptions lead to very different methodological concerns and interpretations, ...

Does managed care represent the death knell for the ethical provision of medical care? Much of the current literature suggests as much. In this essay I argue that the types of ethical conflicts brought on by managed care are, in fact, similar to those long faced by physicians and by other professionals. Managed care presents new, but not fundamentally different, factors to be considered in medi...

Sympatric speciation has always fascinated evolutionary biologists, and for good reason; it pits diversifying selection directly against the tendency of sexual reproduction to homogenize populations. However, different investigators have used different definitions of sympatric speciation and different criteria for diagnosing cases of sympatric speciation. Here, we explore some of the definition...