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:

(1872-1862) American essayist, poet, and philosopher. Best known for his book "Walden", a reflection upon simple living in natural surroundings, and his essay "Civil Disobedience", an argument for disobedience to an unjust state.
Joseph Priestley
Peter Unger
Thomas Paine
Henry David Thoreau