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... The United States is known for the deep polarization between its two major political parties " the right-wing Republicans and left-wing Democrats. Now an analysis of hundreds of thousands of policy documents reveals striking differences in partisan policymakers' use of the scientific literature, with Democratic-led congressional committees and left-wing think tanks more likely to cite research papers than their right-wing counterparts.

The analysis also shows that Democrats and left-leaning think tanks are more likely to cite high-impact research, and that the two political sides rarely cite the same studies or even the same topics.

"There are striking differences in amount, content and character of the science cited by partisan policymakers," says Alexander Furnas, a political scientist at Northwestern University in Evanston, Illinois, and a co-author of the analysis, published1 in Science on 24 April. ...