[Ahh, that question. He looks down at the ground, shuffling his feet a bit.]

In my world, there is something called an X-Gene... those of us who are mutants are born with it. When we're old enough, usually becoming a teenager, our powers manifest. It's completely random and there's no telling who will be able to do what. For most people, it's a very scary time. Nobody wants to be a mutant, after all.