Instructions 20Q Game: These are similar to full games, but for quizzes larger than 20 questions it will randomly select 20 questions from within the set. This is a quick way to get in some studying of a topic.     
Identify the following philosopher:

(1942-Present) American philosopher and professor at New York University. In "Ignorance" (1975), he argues that nobody knows anything and even that nobody is reasonable or justified in believing anything.
Jean-Paul Sartre
Jacques Derrida
Socrates
Peter Unger