So how did I hear about it? Well, it all began some eleven years ago when my older daughter took a freshman biology course at LSU. For extra credit the students could volunteer to have their DNA tested, and so she volunteered. Because we were very interested in genealogy at the time, she called me up rather excited to tell me she had this weird thing they called "Bithil Syndrome," and they had asked to run more tests on her. (To complicate matters, she may have misspelled it; it could actually be Bithel.) Eventually, the geneticist told her she had the purest expression of the syndrome they'd yet found in the western hemisphere. Now, I've always known my daughter had incredible, unnatural hearing; when she was a little girl, you could whisper something in the living room, and she'd open her bedroom door at the other end of the house and shout, "I heard that!"(Yes, it was a pain.) She could read highway signs waaaay down the Interstate. The only aspect of it she doesn't have to any great extent is the quick reflexes; hers are only slightly above normal. And she doesn't have yellow eyes because the color is recessive to brown and, like me, my daughter has brown eyes. But my father had yellow eyes. He was also an incredible marksman and, when we were kids, he spent a great deal of his time yelling at us not to make so damned much noise. So I know exactly where it came from.
So there you have it. This is why I generally avoid talking about it--because it's a sort of personal thing, and the truth is that when I started the series all those years ago I didn't realize just how rare it is, or that the series would go on so long, or that this aspect of it would generate so much interest.