Over a decade ago, the first nationally representative probability survey concerning the teaching of evolution revealed disquieting facts about evolution education in the United States. This 2007 survey found that only about one in three public high school biology teachers presented evolution consistently with the recommendations of the nation s leading scientific authorities. And about 13% of the teachers emphasized to their students that creationism was a valid scientific alternative to modern evolutionary biology. In this paper, we investigate how the quality of evolution teaching, as measured by teachers reports of their teaching practices with regard to evolution and creationism, has changed in the intervening 12years. We find substantial reductions in overtly creationist instruction and in the number of teachers who send mixed messages that legitimate creationism as a valid scientific alternative to evolutionary biology. We also report a substantial increase in the time that high school teachers devote to human evolution and general evolutionary processes. We show that these changes reflect both generational replacement from teachers who are new to the profession and changes in teaching practices among those who were teaching in the pre-Kitzmiller era. Adoption of the Next Generation Science Standards, along with improvements in pre-service teacher education and in-service teacher professional development, appears to have contributed to a large reduction in both creationist instruction and mixed messages that could lead students to think that creationism is a scientific perspective. Combined with teachers devoting more hours to evolution including human evolution instruction at the high school level has improved by these measures since the last national survey in 2007.
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