The more you study intelligence, the more you realize that "smart" is such a vague concept that it is borderline useless. Example: whose work was more difficul

The more you study intelligence, the more you realize that "smart" is such a vague concept that it is borderline useless. Example: whose work was more difficult to understand? Godel's work came "naturally" to Godel; Einstein's came "naturally" to Einstein. They are both "unnatural" for most people. That says nothing about smartness, aside of that both are capable of something that most are not. Next question: was Godel better at math than Einstein was at physics? My answer is "... huh?"