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:

(1818-1883) German philosopher, economist, and socialist revolutionary. Lived stateless in exile in London for decades. Best-known titles are the 1848 pamphlet, "The Communist Manifesto", and the three-volume "Das Kapital" (1867).
Karl Marx
Alan Turing
Hypatia of Alexandria
St. Thomas Aquinas