Reply #19: Perhaps he's a white supremacist, the fundamental scientific question however is whether his

[jody]

research conclusions are valid or not?

The Scientific American link I gave above says:

This much is uncontested: for most of the 20th century, blacks worldwide have scored, on average, 15 points lower on most IQ tests than whites have.

What scientists cannot agree on is why. Most attribute the gap to differences in education, health and other environmental influences. Hereditarians, on the other hand, view the black-white difference as largely genetic in origin.

What's the answer?

I don't know but I do believe such issues must be discussed because they have a major effect on public policy.