xt writes: The Boltzmann equation is old news. What's news is that the 140 year old equation has been solved, using mathematical techniques from the fields of partial differential equations and harmonic analysis, some as new as five years old. This solution provides a new understanding of the effects due to grazing collisions, when neighboring molecules just glance off one another rather than collide head on. We may not understand the theory, but we'll sure love the applications!
...though his invention worked superbly -- his theory was a crock of sewage from
beginning to end. -- Vernor Vinge, "The Peace War"