The world view of particle physics is a picture of chaos beneath order. At the fundamental level is a confusion of continual creation, annihilation and transformation. Above this confusion, limiting the forms that it can take, are a set of conservation laws. They do not specify what must happen, as ordinary laws of physics do, rather they specify what cannot happen. They are permissive laws. At the subatomic level, absolutely everything that is not forbidden by the conservation laws actually happens.
