Interesting suject and definitely one that people have strong views on. Personally I would go with the article a way up the page that said most differences are superficial (eg, skin hair etc.).

Having said that, any idea is worth looking at. I personally wouldn't expect genetics to have any noticeable effect on IQ, but if it did, there would surely be all sorts of implications. Tricky thing to experiment on though. How on earth would you keep cultural factors, quality of education etc constant when you can't really even measure them?

Also such information would create havoc. Imagine for example that it was proved that one race had a higher IQ than another and it was genetically based. The variation within that genetic group would presumably be as big as in any other. So you would still have very clever people in the 'stupid race' and very stupid people in the 'clever race'. Very few of the clever people who had the wrong skin or nose or whatever would get jobs in areas where intelligence is perceived as important though.

On top of that, IQ doesn't really 'mean' a whole lot. There's no link to common sense. There's no link to work ethic. There's no link to monetary, romantic or any other form of success really other than academic.

At the end of the day it sounds as if this particular comment was just someone prejudiced speaking his mind, but I don't think any subject area should be taboo. You won't make society better by censoring ideas. You might if you teach people to think those ideas through and question them.