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:

(1808-1887) American political philosopher and pamphleteer. Wrote the seminal abolitionist book "The Unconstitutionality of Slavery". Also known for competing with the Post Office with his American Letter Mail Company.
Arthur Schopenhauer
B. F. Skinner
Søren Kierkegaard
Lysander Spooner