You seem to have completely missed the point. No one said that race determines intelligence. People seem to be acknowledging that intelligence amongst groups of people is distributed along a bell curve.
Why do you accept that different races can have discernibly different physical characteristics but that it is metaphysically impossible for characteristics related to brain physiology to differ? Is your belief based on science or wishful thinking? ("It would be so horrible if it were in any way remotely true, it cannot possibly be true!")
Is it possible, could it be possible that certain genes related to cognitive ability and development might differ slightly in various ways between the races and different ethnic groups? Why is that so inconceivable?
The problem is that intelligence is extremely difficult to measure--yes, it's possible and perhaps probably that you can differentiate genes that might have corollary effects on intelligence, or ability to learn; and we certainly know that certain people have more "plastic" brains, some have photographic memories...traits that make the accumulation of knowledge vastly easier of them, or a natural ability to solve problems (perhaps a better indicator of intelligence than simple knowledge accumulation).
Thing is, while these traits are somewhat inheritable, the expression of these qualities in the individual is largely a function of population-meaning, what access did this person have while growing up? How were they nurtured? Tying this to race is spurious at best, as it requires acknowledging that these qualities can certainly by attributed across communities and populations and hey! look at the common race found within each population! That is highly problematic, because the selective process is population, not
race which, at the genetic level, remains more or less meaningless.
Additionally, for those that are screaming racism, I don't see many people here mentioning skin color; they are simply suggesting what I say above, but trying to equate population effects with race--which is rife with error.