Duckies argument about spheres have no edge isn't so different than the argument that CTE cannot work as described. There are those that lock themselves into a discreet definition of what is being said, instead of applying it to the context being used. In a literal sense, it's true spheres have no edges. However if you are referring to the visible boundary perceived from a circle that overlaps its center with the sphere center, then it makes sense. You either understand, or don't understand, or just refuse to because you are locked into you own definitions in an almost autistic way.