User blog comment:B214/Question and Answers 6/@comment-99.235.66.221-20161130072837/@comment-3965848-20161130134602

I would assume they can, I mean how else did Magicians came to be, they probably had ancestors who were regular humans who discovered and studied the mystic arts, or to put it in scientific terms; Quantum Mechanics.

A counter theory would be genetic, certain humans who possess some latent capability and managed to unlock it and pass it down to decedents. Even today there people who possess super abilities with chance to pass it down to their children.