This article studies the impact of health insurance on individual out-of-pocket health expenditures in China. Using China Health and Nutrition Survey data between 1991 and 2006, we apply two-part and sample selection models ...

The ability of plethodontid salamanders to jump has been recognized for over 100 yr, but the mechanics of the jump are only now being elucidated. These salamanders often autotomize tails that can be as much as a third of ...

High-multiplicity Kepler systems (referred to as Kepler multis) are often tightly packed and may be on the verge of instability. Many systems of this type could have experienced past instabilities, where the compact orbits ...