Obviously this was a special episode amongst the special series for which we are all grateful (Thank you," Lex).  But what struck me was the ongoing quiet tenor of humor running through the conversation that broke out at moments "generous spirit of the question" / "gunpoint" (<a href=""https://www.youtube.com/watch?v=gU-mkuMU428&amp;t=1h07m07s"">1:07:07</a>) between two friendly but not completely overlapping thinkers.  It underscores the humility and humanity."