http://x-men.wikia.com/wiki/Mutant In Marvel it is also said the Celestials created the chemical, energetic and biological framework for mutants to develop in later earth era's. This can stem from a real idea that perhaps Aliens planted Mutant potential within a fraction of humanity. Also Radiation is another overlapping suggestion that harms most life but simultaneously may stimulate X-Gene's. Now I could share if I wanted to on a practical way where almost anyone can develop mutant superhuman abilities from deeper dormancy but I'd hate to throw off the balance of the way things are LOL Yes the difference between a mutant and not mutant is the mutant had their abilities closer to the surface already while all the rest of humanity has it more dormant. In all cases, its a matter of how available and accessible to manipulate the human X-Genes. These Genes are real ladies and gentlemen.

Erol