[Juneteenthism] Cal Professor John Ogbu knows why rich black kids are failing in school, do you?

Back in the 70's, when I was at uni, I read an article which suggested that "black Americans (the term used back then) were less intelligent than their white counterparts. Shortly thereafter I read an article which suggested the opposite. The writers of the second article were wise enough to acknowledge the first article and reproduce the two tools used to measure intelligence in both reports. It is the tests that were biased, not the intelligence of the groups. Maybe some of the same issues exist here.