My best teachers were not the ones who knew all the answers, but those who were deeply excited by the questions they could not answer.
~ Brian Greene
(My perspective: I frequently observe this excitement in children as opposed to adults. A visceral response. You can see in their eyes the wheels turning, the neurons dancing, their bodies fidgeting and then BAM! The light bulb comes on. The electricity is contagious and you want to belt out like some Tarzan with them as they celebrate in their discovery and generate new lines of inquiry to pursue. And I think this supports what many believe…that our greatest teachers in life are children.)