ENG. The Molecular Script adds some really important functionality to Blender like interaction of particles each other.
Moby Motion has published a tutorial using Molecular Script and becomes useful for lack of adequate documentation.

ITA. Molecular Script aggiunge importanti caratteristiche a Blender, tra cui l’interazione delle particelle tra di loro.
Moby Motion pubblica un tutorial utilizzando Molecular Script e diventa particolarmente utile vista la mancanza di un’adeguata documentazione.

Link: Ball Pit Simulation on Youtube
Link: Download link for the Molecular Script by PyroEvil