2014 (UTC) 
 ::::I agree about the second controversy not being appropriate in this section but the little green woman, or some discussion of why it matters what the host knows, should be presented somewhere near the beginning, before mention of the 'conditional' solutions.  That is one of the most surprising things about the problem to most people, that (what the player knows about) what the host knows, completely changes the odds.    14:12, 20 September