You know, I was just looking at my previous comment, and I realized that it's really easy to miss the italics on the "a" in the phrase "I try not to make statements based on a book". Without that emphasis, it reads entirely differently than I intended ... I not only sound like an arrogant jerk (which I will cop to), but willfully ignorant and disdainful of the printed word (which I am most certainly not).

Let me clarify: I try not to make statements of form opinions based on one source. If I run into a claim that intrigues me, like this one, I try to evaluate it in terms of other sources, including reviews and responses from other people in the same field.

I had no intention of dismissing your source out of hand, but I can't evaluate data that's unavailable to me.

(I really, really liked Elaine Morgan's "Aquatic Ape" theory of human origins, but it just didn't hold up under scrutiny.)