If I've seen a face before, I can nearly always remember it in less than a second. Well under a second.

Wow. Just... wow.

I'd never heard of it as something you could be born with.

Yeah - it's actually mentioned in the online book I linked to. People who have it don't realize it's ununsual, or can't figure out how to explain it, or, or, or... so it's only when a dramatic change causes it (injury, whatever) that it used to be noticed.