Forced Explanation Virus, otherwise known as F.E.V. (not to be confused with Fart Enchancing Virus) its a hoax created by Chris Avellone to give an explanation to things such as Super Mutants, Radscorpions, Mole Rats and Paladin Hoss.Chris Avellone made the inhabitants of the post-apocalyptic wastes to believe in F.E.V. so they dont annoy him with plotline issues, retcons and worries about the canonicity of certain events. Some question if the F.E.V. really does exist, but they usually dont think very much about it because they have more important things to worry about... such as Super Mutants, Radscorpions, Mole Rats and Paladin Hoss.