vois ici 10,000 hour challenge of microbe
rencontre homme salon de provence
http://delab.it/?direktor=quando-un-uomo-con-la-pistola-incontra-uno-con-il-fucile&101=2f An nice example of using in the Beamer class in LaTex
http://inspirated.com/2010/03/08/using-overlays-for-source-code-listings-in-latex-beamer