This is one of the most discouraging things I've ever seen. A survey of 1,005 adults chosen at random was conducted by phone last June. The subjects were asked twelve questions based on general scientific knowledge. The questions are very simple. I got all twelve right, which is fine -- except that I am among only 10% who did so.
Did I mention how simple these questions are? Take the survey for yourself, at http://pewresearch.org/sciencequiz/quiz/. The web page following the quiz gives the scoring breakdown.
What are we teaching in our schools??