Until we break a bone or two, we tend not to spend too much time thinking about our bones, where they come from, and how we know what we know about them. Well, today we've got a bone to pick with our own skeletons. We'll talk with Brian Switek, author of the book "Skeleton Keys: The Secret Life of Bone", about where your skeleton comes from, and how so many of the skeletons scientists have studied have complicated pasts and uncertain futures.