While the trend here seems to have shifted to blaming the teaching systems, I'd like to point out it doesn't say 1 in 4 STUDENTS, I would imagine that there are a ton of adults that didn't answer the question correctly. Many who probably knew at one time or another, and just let it fade away. Particularly math and science that many adults simply don't use and don't care about, we forget. Also the median age of pollable people is getting older and older because of landlines being replaced by the youth with cellphones. No offense intended but I'd bet these results have much more to do with old age than teaching the young.