The equilibrium of fluids was ascribed by Pascal to the principle of virtual velocities above mentioned. This principle or law of nature has been thus enunciated: “Forces in equilibrium must be ...

The Hardy-Weinberg equilibrium can be disturbed by a number of forces, including mutations, natural selection, nonrandom mating, genetic drift, and gene flow. For instance, mutations disrupt the ...

A scientist gives an answer to a long-standing question in theoretical glass physics: what does it mean to be an order parameter for an inherently out-of-equilibrium system? Starting from first ...