The bloggosphere is alive with speculation that Bill Clinton's recent blow-ups and unstatesmanlike behavior are a consequence of his bypass surgery four years ago.  Is there any merit to this?  The jury is out.  On one hand, it's not really clear that this behavior is abberant (though it seems to be).  On the other, studies of bypass patients, most notably one a few years ago that was done at Duke, showed that half of those who had undergone bypass surgery had memory and thinking problems right after surgery, problems that were still evident five years later.