I would say the last good episode was was the last one, the conclusion to Fabric of the Cosmos. I think it remains a pretty solid program except the upcoming Deadliest Volcanoes sounds a little Discovery/History/TLC ish. I’m much more dismayed over what’s happened to those three networks than any particular dumbing down of Nova. Of course, Nova is now sharing time with NovaScienceNow, (list of episodes). I thought “How Smart Are Animals” was especially interesting.