Bob Newhart won a Guest Actor, and quite deservedly, for his appearance last season as former TV science host “Professor Proton.” Astoundingly, it was the first performing Emmy won by Newhart, ever. And tonight, he gets another shot, reprising the role in a new episode that pits his Professor Proton against another TV science celebrity – played, quite appropriately, by Bill Nye, as in Bill Nye the Science Guy. Putting these two guys together ought to make for some fairly combustible comedy. What fun.