Thank you, Lex.  Thank you, Brian.  I've enjoyed lots of Lex's episodes but I LOVED this episode.  I'm so grateful long discussion has become more common. I finally got to see closer to the whole Man, Brian Greene that's just not possible in symposium format and I really like what I see, the wonder and curiosity of childhood tempered by discerning intellect, open in the most rational way. Superb!