"Yes. Science can define anything. And in searching for truth we have managed to define the very building blocks that make us look the way we do. See, at the very smallest level, there are things called genetic codes, like a magic spell. The codes determine exactly how a person will look. Well, some of those aliens I mentioned? They messed with the human genetic codes, and created an unpredictable code in the human genome, which is another word for the code, that unopredictable code makes mutants, which is what we call people like me, show uop every now and then."