D H

That was my sole contribution to this thread. I'm surprised no one made the connection between the article cited in the OP and the thread "Why Most Published Research Findings are False". Positive results might well result even if the underlying hypothesis is false. I suspect this is not the case here. They simply didn't measure what they purported to measure.

From my reading of the Slate article, this is not an intelligence test. It tests visual acuity and reaction time, both of which are highly correlated with age. A person's political orientation is also highly correlated with age. It is not surprising at all that the testers found a correlation between the test results and policical orientation. This made it into Nature????