Another wonderful documentary from PBS & NOVA. The filming and narration were very well done. I feel that Narrator Keith David has one of the best voices for documentary narration. The audio was well balanced. The background musical score was a perfect choice and never once did it overpower the commentary. The story line was very interesting, thought provoking, and left it up to the viewer to make their own conclusions. I highly recommend this episode, and generally just about all programming from PBS / NOVA. As can be seen in the previous "reviews", which are more of a personal conclusion to the show's content than review, that NOVA has accomplished what it sets out to do. Impart knowledge that stirs it up, makes people think, and gets them talking. Great job, and thanks HULU.