I think this is the video Gell-Mann is talking about where Feynman "advocated on national television that people not brush their teeth": http://www.youtube.com/

I think this is the video Gell-Mann is talking about where Feynman "advocated on national television that people not brush their teeth": http://www.youtube.com/watch?v=PsgBtOVzHKI&feature=player_embedded http://www.youtube.com/watch?v=PsgBtOVzHKI&feature=playe... . He doesn't actually advocate it, but uses it as an example of how to look at the world.