 Not much attention was given to skepticism in the 18th century French materialist philosophy. However, Paulo Jonas de Lima Piva (Brazil) (2007, 2008a,b) has done some work focusing especially on Diderot. Sébastien Charles (Québec, Canada) (2007) called attention to some clandestine skeptical manuscripts as well as to many less known skeptics of the period, not only in France, but also in Germany. Charles (2012) and Rodrigo Brandão (2008) explored the relations between Voltaire and skepticism.