Changing Abundances, Changing Opacities

Cascading top-down effects of changing oceanic predator abundances.

1. Top-down control can be an important determinant of ecosystem structure and function, but in oceanic ecosystems, where cascading effects of predator depletions, recoveries, and invasions could be significant, such effects had rarely been demonstrated until recently. 2. Here we synthesize the evidence for oceanic top-down control that has emerged over the last decade, focusing on large, high ...

Solar Models with Revised Abundances and Opacities

Using reconstructed opacities, we construct solar models with low heavyelement abundance. Rotational mixing and enhanced diffusion of helium and heavy elements are used to reconcile the recently observed abundances with helioseismology. The sound speed and density of models where the relative and absolute diffusion coefficients for helium and heavy elements have been increased agree with seismi...

Changing perceptions, changing reality.

Changing families, changing workplaces.

American families and workplaces have both changed dramatically over the past half-century. Paid work by women has increased sharply, as has family instability. Education-related inequality in work hours and income has grown. These changes, says Suzanne Bianchi, pose differing work-life issues for parents at different points along the income distribution. Between 1975 and 2009, the labor force ...

Changing Minds, Changing Brains

Measures of brain function are used today in many areas of psychological research, and developmental psychology is no exception. The infusion of cognitive neuroscience into psychology has been met variably with enthusiasm, skepticism, and opposition. The most productive attitude towards this sea change, I maintain, consists of a healthy dose of both enthusiasm and skepticism [see also Kagan, 20...