As How I Met Your Mother ends, here's a scientific look at what makes a great sitcom

[youtube http://www.youtube.com/watch?v=j4caCCCWI-E&w=600&h=315] How I Met Your Mother concludes this evening. Maybe 2-3 years ago, I would have called it my favorite show on television. Now it's still in the discussion there, but because I cut cable this past summer and didn't always want to sit down to watch the final season at the exact time it aired…