Added hand interactions for optimization: one hand is place starting point, two hand is the learning rate scales as you increase distance between hands(its heuristic, a quadratic with a slow quadratic rate so you can get really small and really big, might need to make the quadratic part smaller though or add a linear part).  Changed text on optimization slide to read learning rate and optimization start, the two parameters you can vary.  Changed text on matrix manipulation slide to be full matrix as before, but also another line with A = rotTranspose * eigs * rot so when you rotate you can see that you only change the outer matrices, not the eigenvalues.  Seems really good now.  Made optimization line be much thicker and more visible, not a tiny line anymore. Need to fix clipping when looking at descent or more generally not the original meshes, and make it so the slides rotate between opt and matrix stuff after going through the whole slideshow.