More disturbing is that only 28% of public school science teachers teach evolution according to the standards recommended by the National Research Council, 60% apparently "compromise" on the teaching of evolution vs creationism (whatever that means), and 13% explicitly teach creationism in their classes.

http://www.nytimes.com/2011/02/08/science/08creationism.html?_r=1&scp=1&sq=evolution%20biology&st=cse