Muscle contraction is the tightening, shortening, or lengthening of muscles when you do some activity. It can happen when you hold or pick up something, or when you stretch or exercise with weights.

Particle robots are composed of loosely coupled components, or particles, that lack an individual identity or addressable position. They are capable of only a simple motion -- expansion and ...

A computer model or "virtual stomach" revealed a central "road" in the human stomach, dubbed the Magenstrasse, that could explain why pharmaceuticals sometimes have a large variability in drug ...