To give you an idea about genetic variation between each of us, there are about three million differences in our genetic code. They go to influence the color of our hair and the color of our eyes, the way we walk.
It's really hard just to watch someone walk to decide what's wrong with them. A better way is to do what's called Three Dimensional Gait Analysis, and that's where the child comes into one of our labs. Here, we put markers on their face, hands, and legs. We have a computer and a bunch of cameras all around the room. And then we're able to break down the gait into three dimensions.