Fission and Fusion, are two atomic activities that humankind hopes to implement. Fission on a small scale is simply radioactivity, and on a large scale it is an atomic explosion. Fusion, on the other hand, is sort of the opposite.
It happens in the sun, and produces unheard of and almost immeasurable heat.
Humankind can produce it, but since the heat is so great, it melts any container that holds it. Science proposes to suspend from magnets any elements undergoing fusion.
You didn’t know how awesome the origin of that cute sunbeam was?