This probably seems naiive, but why? My main question being that why isn't hydrogen the most stable. It is the simplest and should be, right? If everything wants to arrive at the lowest possible energy state, why do nuclei want to arrive at iron? I can understand splitting atoms (fission) perfectly well, it makes sense. Fusion of atoms also makes some sense, except for hydrogen, again. Can someone tell me why this is true? I am sure i am missing something crucial here...