http://mt-creations.fr/class.php 10,000 hour challenge of microbe
http://bodych.pl/?slomat=grodzisk-mazowiecki-randki&f5e=d3
une lecture fantastique
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