Three-dimensional (3D) bioimaging, visualization and data analysis are in strong need of powerful 3D exploration techniques. We develop virtual finger (VF) to generate 3D curves, points and regions-of-interest in the 3D space of a volumetric image with a single finger operation, such as a computer mouse stroke, or click or zoom from the 2D-projection plane of an image as visualized with a computer. VF provides efficient methods for acquisition, visualization and analysis of 3D images for roundworm, fruitfly, dragonfly, mouse, rat and human. Specifically, VF enables instant 3D optical zoom-in imaging, 3D free-form optical microsurgery, and 3D visualization and annotation of terabytes of whole-brain image volumes. VF also leads to orders of magnitude better efficiency of automated 3D reconstruction of neurons and similar biostructures over our previous systems. We use VF to generate from images of 1,107 Drosophila GAL4 lines a projectome of a Drosophila brain.

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We use a fixed effects panel data model to investigate the impact of institutions of governance on the educational attainment of immigrants to the United States over the period 1988-2000. Distinguishing between the quality and stability of political institutions in the countries of origin, we find that the two characteristics of institutional structure have conflicting impacts on the nature of brain drain. Immigrants from countries with a higher quality of political institutions tend to be better educated, on the average, than immigrants from countries with institutions of lower quality. However, immigrants from countries with greater political instability tend to be better educated than immigrants from countries with more stable governments.

This article explores the impact of gender equality on economic growth. In particular, we focus on the multidimensional nature of gender equality with the object of identifying the relative salience of different aspects of equality. Using exploratory factor analysis on five measures of gender equality, we identify two distinct dimensions: equality of economic opportunities and equality in economic and political outcomes. Regression analysis conducted on an unbalanced panel of 101 countries taken over nonoverlapping five-year periods from 1990 to 2000 reveals that a standard deviation improvement in equality in economic opportunity increases growth by 1.3 percentage points and a corresponding improvement in participatory equality improves growth by an average of about 1.2 percentage points. However, this impact is contingent on a country's stage of development: while developing economies experience significant improvements in growth from greater equality in opportunity, developed societies see significant improvements resulting from greater equality in outcomes.