@Teufel,
I looked it up, it seems to be a decent study. However, they lose points because
1) They didn't publish the actual questions used.
2) Nor did they publish the
metrics. If someone responded that 1 million Jews were killed... would this be a correct answer or an incorrect one.
I don't think the headline is correct. Here are two question to think about....
1) How many things did you learn in high school history that you no longer remember?
2) If someone accepts the Holocaust happened, but doesn't know any of the actual historical names of the death camps, who care?
I am not sure I care about this story. Adults (and it isn't just Americans) forget a lot that they learned in high school.
So what?