> You're speculating that a US president has a relatively average intelligence - why are you assuming that

I am not assuming that: any range that has studying nuclear engineering as its floor is above average intelligence. I thought it was self-evident, but apparently not - perhaps not many people know what a "Navy Nuke officer" is. To be more explicit the range is between above average intelligence and "genius". Regardless, I will never be convinced that people with relatively average intelligence are precluded from greatness; so excuse my scepticism when fellow nerds pat themselves on the back for being the engine of the world without pointing at any research that bears this idea out.