Of course, demonstrating intelligence, knowledge and willingness to do the research is one of the primary ways to get yourself excluded, as the prosecution wants room temperature IQs who will say 'guilty' when prompted. If you want to get out of it, all you really need to even do is say the words "jury nullification".

Myself, I've never been asked yet, but if I was, I think I'd do it for most cases as someone has to be there who understands the powers a jury actually has, but get out if it was something really bad or one that's likely to last for months and months.