It is way too late for me to be posting this, but I have to defend poor Dr. Ledderman.
Clark is impossible, according to our current understanding of the way the universe works. Not just slightly impossible, but extremely impossible. Dr. Ledderman, like Lois before him, can be excused for not considering this possibility until he sees incontrovertible proof. As Carl Sagan liked to say, "Extraordinary claims require extraordinary evidence." Any scientist who went straight to the conclusion that Superman was involved from the evidence Dr. Ledderman has seen so far would not be a very good scientist.
