>It could be that the scientists are simply smarter; most physicists could, if necessary, make it through a PhD program in French literature, but few professors of French literature could make it through a PhD program in physics.
I think this is a pretty unfair generalization, and furthers the stereotype that STEM majors are smarter/harder-working/generally better than liberal arts majors. It is not inconceivable to me that most people choose to major in something they are passionate. I think people who choose a major just because they perceive it as easy are a small minority of students.
Aside from that, I personally believe academic success is primarily due to hard work, rather than intelligence. I imagine almost all PhDs are reasonably intelligent and could in fact make it through a physics program, provided they were willing to put in the time and effort.
I think this is a pretty unfair generalization, and furthers the stereotype that STEM majors are smarter/harder-working/generally better than liberal arts majors. It is not inconceivable to me that most people choose to major in something they are passionate. I think people who choose a major just because they perceive it as easy are a small minority of students.
Aside from that, I personally believe academic success is primarily due to hard work, rather than intelligence. I imagine almost all PhDs are reasonably intelligent and could in fact make it through a physics program, provided they were willing to put in the time and effort.