There was a comment on iSteve, where someone said that perhaps whites were not intrinsically smarter than the global average (of about 90) but, that they've had a headstart of a century of Flynn Effect.
this is an actual possibility, watching the flynn effect in devloping vs industrialized nations is what led to the idea (AFAIK)
there's not enough data to be able to draw any conclusions, partly due to the stigma of intelligence research.
