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There was a study concluding that the left-wing brain tolerates ambiguity better. This may in part explain why science is dominated by the left (only 6% of scientists in the US are republicans).
"Study finds left-wing brain, right-wing brain": http://www.latimes.com/news/obituaries/la-sci-politics10sep1...
"Only Six Percent Of Scientists Are Republicans: Pew Poll": http://www.huffingtonpost.com/2009/07/10/only-six-percent-of...