Listen starting at 53:30 to http://www.twiv.tv/2012/12/09/twiv-210-bond-covalent-bond/ They also added links to the model on their web site.
The Spanish Flu model has been run over 20 times and the movies viewed over 10 times recently.
My email to them that triggered this can be found at http://www.twiv.tv/letters/ (search for Spanish Flu).