Assessing scientific knowledge in the American public...

Assessing scientific knowledge in the American public...  That's the objective of this survey, which I just took.  Mid-way through the 13-question survey I started wondering where the tough questions were.  There weren't any – these were all trivially easy questions that I'd expect any adult American to know.  At the end of the survey, there's a graph showing the distribution of the number of correct answers (below) in the original survey.  There's also a chart showing cross-tabulations by question against age, education, and gender. 

I find these sorts of data to be very disheartening...