This article adds to the long-lasting discussion about John Lott's questionable research and statistics, and reliability as a scientist in general. It isn't short, but very interesting.
https://thinkprogress.org/debunking-john-lott-5456e83cf326#.prmzzl65s
https://thinkprogress.org/debunking-john-lott-5456e83cf326#.prmzzl65s