I don't really get it. whether Lex really doesn't know what branch prediction and parallelism is or he just wants to inform viewers about it? This is what u study in a computer architecture course. Hennessy and Peterson is a good start.,(reply>), I think Lex knows a lot more than he is letting on to be a good host, for sure.  You can see hints of it when he asked "what's sad about that?" and then Keller had to say because it was complex, to the part he already explained.  It was a bit awkward and anticlimactic.  You can tell when Lex knows the direction he plays the straight man.