How can a crackpot be recognized? Angela Collier presents an example as follow-up to the first course in this YouTube video. There is one question left over: do you share the judgement? Is is legitimate to speculate in science? Where exactly is the red line to distinguish scientific avant-garde ideas from blank nonsense? Is string theory a story made up by a community of crackpots? Or is it bleeding edge science in terra incognita?