1. Who was Plato's teacher?

2. Who was Aristotle's teacher?

3. Who founded existentialism?

4. Who is Hilde's father?

5. Who considered freedom a burden?

6. Where was Hilde's father stationed?

7. Who does Hilde's father work for?

8. What is Alberto's dog's name?

9. Where is Alberto in the videotape he gives to Sophie?

10. Who believed in a world of ideas?

11. Who believed it is possible that we exist only in God's mind?

12. Who believed the world conforms to our mind?

13. When did the idea of returning to nature become popular?

14. Who is famous for doubting?

15. Who felt that philosophy needed to be practical?

16. Who believed that people act according to their feelings, not their reason?

17. What is the name of Sophie's best friend?

18. Who argues that religion is a matter of either believing or not?

19. Who developed the theory of natural selection?

20. What period was characterized by an emphasis on humanism?

21. Who focused on the world spirit?

22. Where did Socrates live?

23. Who believed material forces shape history?

24. Who "Christianized" Aristotle?

25. Where does the book take place?