Mari Villar was slammed by a car that jumped the curb, breaking her legs and collapsing a lung. Amy Paulo was in pain from a ...

I didn’t want to keep waking up feeling like I was 95.” You don’t have to be a marathoner, however, to suspect your body might actually belong to a nonagenarian. So many of our daily activities, from ...

Human movements like hopping and running can be explained using a spring-mass model. In this model, the leg works like a ...