Here are some highlights from Yahoo News on the study findings:

There's no gentle way to put it: People who give in to racism and prejudice may simply be dumb, according to a new study that is bound to stir public controversy.

The research finds that children with low intelligence are more likely to hold prejudiced attitudes as adults. These findings point to a vicious cycle, according to lead researcher Gordon Hodson, a psychologist at Brock University in Ontario. Low-intelligence adults tend to gravitate toward socially conservative ideologies, the study found. Those ideologies, in turn, stress hierarchy and resistance to change, attitudes that can contribute to prejudice. ...

The findings combine three hot-button topics. "They've pulled off the trifecta of controversial topics," said Brian Nosek, a social and cognitive psychologist at the University of Virginia who was not involved in the study. "When one selects intelligence, political ideology and racism and looks at any of the relationships between those three variables, it's bound to upset somebody."

Polling data and social and political science research do show that prejudice is more common in those who hold right-wing ideals that those of other political persuasions ...

Earlier studies have found links between low levels of education and higher levels of prejudice, Hodson said, so studying intelligence seemed a logical next step ... As suspected, low intelligence in childhood corresponded with racism in adulthood. But the factor that explained the relationship between these two variables was political: When researchers included social conservatism in the analysis, those ideologies accounted for much of the link between brains and bias. People with lower cognitive abilities also had less contact with people of other races.

Hodson was quick to note that the despite the link found between low intelligence and social conservatism, the researchers aren't implying that all liberals are brilliant and all conservatives stupid. The research is a study of averages over large groups, he said.

Nonetheless, there is reason to believe that strict right-wing ideology might appeal to those who have trouble grasping the complexity of the world. "Socially conservative ideologies tend to offer structure and order," Hodson said, explaining why these beliefs might draw those with low intelligence. "Unfortunately, many of these features can also contribute to prejudice."

They found that what applies to racism may also apply to homophobia. People who were poorer at abstract reasoning were more likely to exhibit prejudice against gays. As in the U.K. citizens, a lack of contact with gays and more acceptance of right-wing authoritarianism explained the link.