Savants are not always born
I have no background in medicine, but it fascinates me as much as it does most people. This article is more interesting - and more baffling - than most. It cites examples of people who get hit on the head and then have talents they didn't have before. Are we tapping into some kind of genetic memory (which shouldn't be possible), or what is happening here? The weirdest case concerns a pianist who handles complex pieces beautifully (there's a clip here) with no training. Think how many years go into training that - keeping in mind it's not just knowledge, but physical skills, the ability of fingers to act in perfect coordination.
It makes no sense, really. But some things don't, despite all our advances.