We do not. Are there answers to the questions I presented? You can't observe any exact thing and say "Right there! This person is exactly 49 intelliunits smart"

We do not. Are there answers to the questions I presented? You can't observe any exact thing and say "Right there! This person is exactly 49 intelliunits smart". IQ tests may give you an idea of one point of view of a measurement of intelligent is, but it is certainly not concrete like 12 inches is. Not concrete like we know 2 hydrogens & one oxygen is water. I think our obsession that everything must be measurable & categorized fails when it comes to the human mind. We are more than the sum of our measurable parts... for now. You can look at a car engine specification and know exactly the maximum speed given optimum conditions and assuming no mechanical failures. There's no such measurement for the human brain. You cannot know what my top performance is. At the absolute best, you can have a ball-park guess. You could end up being right or being way off.