A couple of political scientists out of Penn State University went looking into the way evolution is taught in classrooms, and discovered that the vast majority of teachers are overly cautious in their presentation of the concept, contrary to National Research Council guidelines.

Thirteen percent of the 926 biology teachers who responded to the survey taught creationism and/or intelligent design. An additional 60 percent, according to this Miller-McCune report, failed to “consistently present the evidence for evolution as a unifying theme in biology.”