Yes I probably wasn't as clear as I should have, that of course 'race' is very loosely defined. But it's not just completely made up is my point. Saying it is completely a cultural construct is just plain wrong, and as such not conducive to convincing anyone in an argument.

And then of course with ever increasing mobility, the differences are probably 'smoothing out' so to speak.

>Otherwise racial differences would be of no more significance than, say, differences in hair or eye color.

Interesting example, because red haired people generally have more sensitive skin and are prone to burning in the sun. This is an example of the kinds of differences that it is actually interesting and helpful to study.