08-18-2015, 12:58 PM
That arm bone study... doesn't the humerus turn at least a little bit when the forearm flips upside down? Does it really stay completely in the same position? I"m not criticizing your study, I'm just rather curious now. It _feels_ like it might be turning when I feel my own arm, but that may very well be just the muscles enclosing the humerus bone that are moving, and the bone inside isn't budging at all. .... Wouldn't it be great to have an X-ray machine and a willing victim to watch them move their body parts and we get to study the motion while only seeing the skeleton?