Why do they do this?
	• Many of the problems arise from the fact that students use common sense rather than reason using the physical principles they have learned. – Students use their natural and spontaneous responses based on experience and overly simplistic reasoning. (“I know how light [or motion {or electricity}] works. I don’t need to go through that confusing physics stuff to get the answers.”) – Most students do not spontaneously seek to build the tight consistency and coherence required by a scientific approach.  It needs to be learned (and taught).