The particles that constitute our Universe, in its so-called “ordinary matter and radiation” component, are all electromagnetic in nature, defined by the unification of their three possible interactions. We know that the fourth interaction (gravitational) is significantly different in nature from the other three. Here, we intend to describe how the so-called “stable” particles of ordinary matter can be composed of those that constitute their most fundamental building blocks. These particles decay in a time ranging from 10−6 s to 10−16 s, except for the proton, which is extremely stable.