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Though the randomized control trial is seen as the gold standard for untangling correlation from causation, practicality and ethics often mean we have to make do, says Dennis Cook, a professor of statistics at the University of Minnesota

Images from the 2013 Wings Over Houston airshow are featured

In his opening statement of the trial, Teymouri told the judge that Barron and Leiva tortured and abused Anthony for two weeks before his death, while an attorney for Leiva countered that his client should be acquitted of murder

Disparities in Air Pollution Exposure in the United States by Race/Ethnicity and Income, 19902010