Doctors often ask me, “How tough should I be with my staff?” Consider America’s marsupial, the humble opossum. Biologists know that “playing possum” is not some coy act. The animals actually pass out from sheer terror. Do your staff members look similarly dazed when you approach them? Or, at the other end of the spectrum, are you ophthalmology’s Rodney Dangerfield, so meek that you get no respect?